Executive Team

Chris serves as the President of Raba Kistner, Inc. With more than 30 years of experience, exclusively with Raba Kistner, Chris provides strategic leadership and is responsible for the overall operations and resources of the company. In his previous roles he was responsible for scope development, contracting, financial management, and implementation of Raba Kistner’s geotechnical engineering projects across many industries for the entire company. He also served as the firm’s first Marketplace Leader, responsible the business in the Houston area. After earning a B.S. from the University of Colorado, Chris received an M.S. in Civil Engineering from the University of Texas at San Antonio. He has served in state board positions for TSPE and TCEL.
Chris L. Schultz, PE, PMP
President and CEO, Raba Kistner, Inc.
Renan is a strategic and business-savvy professional with over 20 years of progressive financial leadership in the engineering and construction industry. He brings deep experience in leading high performing finance and accounting teams, financial reporting and analysis, acquisitions and integration. Renan is skilled in bridging the gap between business operations and finance & accounting through close collaboration with senior executive teams and operational business units. He has delivered proven results in team building, project management and people management. Renan earned a Bachelor’s degree in Management and Accounting from the University of Massachusetts, Boston, and a Master of Business Administration and Finance from Northeastern University.
Renan Pierre-Louis, MBA
Vice President, Chief Financial Officer
With more than 35 years of experience in the development, delivery, maintenance, and operation of transportation projects, Russel Lenz develops strategic and tactical plans to advance programs and projects that will provide engineering, environmental and construction-related services to the transportation industry. Mr. Lenz’s experience is based on his executive level leadership positions within TxDOT as the Director of the Construction Division, District Engineer for multiple Districts. He also served as the Director of Heavy, Municipal and Utilities Divisions for AGC of Texas.
Russel W. Lenz, PE
President, Chief Operating Officer, Infrastructure
Dick McNary is President and COO of Raba Kistner Project Control. Dick has been with the firm since 1985, working his way up through all aspects of managing the business, from his start as Project Manager. Most recently, Dick has guided his project management group through expansions into multiple markets throughout Texas. He is involved in Chamber of Commerce initiatives and is a graduate of their leadership development program. He also is a past member of the Alamo RMA’s Community Advisory Group for the Loop 1604 and Highway 281 Improvements.
Richard S. McNary
President, Chief Operating Officer, Project Control
After earning degrees from the University of Oregon and Baylor University, Thomas Burr worked for international corporations in environmental consulting and management roles before joining Raba Kistner in 2015. He now manages client development and is involved with state and federal agencies on environmental compliance efforts that involve permitting, testing, regulatory reporting, management and auditing. Tom is also responsible for extending the group’s offerings, including the recent growth of archaeological services and the addition of coastal and hydraulic consulting.
Thomas Burr
Senior Vice President, Chief Operating Officer, Environmental
Gabriel possesses the advanced technical, leadership, communication, and business skills to interact with clients and lead a consulting team to success. His principal practice areas relative to consulting and design experience include construction materials testing and engineering, forensic engineering, and geotechnical engineering. Gabriel has more than 20 years work experience involving management and execution of construction quality control testing and inspection services on major construction projects in Texas.
Gabriel Ornelas, Jr., PE
Senior Vice President, Co-Chief Operating Officer, Consultants
Ryan has a 20-year track record of achievement and experience in operations and business development for technology and engineering companies and specialized knowledge in oil and gas, petrochemical and construction industries. As Senior Vice President, Gulf Coast Marketplace Leader, Ryan is helping establish new offices in Texas and Louisiana and leading the firm’s growth strategy in the Gulf Coast region, including Houston.
Ryan Venable
Senior Vice President, Co-Chief Operating Officer, Consultants
Dr. Gary Raba is a recognized leader among infrastructure engineering consultants in the U.S. After earning three degrees in Civil Engineering from Texas A&M University, he embarked on a 39-year career that has involved significant projects for many governmental agencies and Departments of Transportation around the country. He developed quality assurance software that made Raba Kistner the in-demand partner on some of the largest, record setting projects across the U.S. Gary served as CEO/President of Raba Kistner, Inc. from 2013 to 2020. He now provides strategic leadership and pursues growth opportunities for the company.
Gary W. Raba, D.Eng, PE
Chief Growth Officer
Prior to joining Raba Kistner in 2004, Joe Irizarry spent most of his career with a Fortune 500 service industry firm, focusing on sales management, strategic planning, leadership development, and process improvement. He now leads Raba Kistner’s business development and marketing initiatives, and enjoys helping the firm, its clients, his community and business networks elevate their performances. A Southwestern University graduate, Joe also is chairman of the North San Antonio Chamber of Commerce Government Affairs Council.
Joe A. Irizarry
Senior Vice President, Chief Marketing Officer
Angela Barron leads our Human Resources department and initiatives. Angela is an innovative and strategic human resources expert who enjoys translating business vision into HR initiatives that improve performance, profitability, growth and employee engagement. Angela earned a Bachelor of Science in Business Administration from California State University of Fresno and a Master of Arts in Organizational Management from the University of Phoenix. She is a Professional in Human Resources (PHR), Society of Human Resources Management Certified Professional (SHRM-CP) and a Certified Mediator.
Angela Barron
Director of Human Resources

Operational Leadership

Mr. Arjona serves as a Senior Vice President. He brings over 25 years of experience to his role and his responsibilities include the planning, coordination, and monitoring of subsurface exploration and geotechnical engineering and testing activities. Isidoro is also responsible for Construction Materials Engineering and Testing projects for the firm throughout North Texas and in México, with responsibilities covering pavement, industrial, office and residential buildings, as well as geotechnical review and evaluation of aggregate sources.
Isidoro Arjona, PE, PMP, D.GE, F.ASCE
Senior Vice President
Mickey oversees project planning and execution for growth management, client development and client satisfaction for all divisions of the firm’s business. He also supports and provides leadership for Raba Kistner’s culture of being a mentor and coach, lead the execution of the firm’s core values, the client partnering business model, its growth strategy and the formal planned long-term direction. Mickey plays a major role in leadership of the firm’s Safety Program and the Quality Management System. He provides leadership in talent sourcing and potential acquisitions identification in coordination with the CEO, Chief Growth Officer, Chief Marketing Officer (CMO) and the Chief Operating Officers (COO’s) and other key leaders of the firm.
H. "Mickey" Barrett, PE
Vice President & Market Sector Leader - Energy & Infrastructure (Non-Highway)
Scott is an accomplished business developer with a combined experience in learning and development, sales, project management, business operations and technology applications. He specializes in serving current and prospective clients in the education sector for the Houston area. Scott is highly recognized by business partners and colleagues for being energetic, passionate, solution oriented and team focused. He is proactive and thrives when working in a fast-paced environment.
Scott Blank
Director of Business Development, Houston - Education
Tom Bond leverages over 30 years of project management expertise. His responsibilities include developing premier sports and entertainment projects throughout the U.S. and Canada. Widely respected in the industry, Tom holds a track record of successfully delivering of highly visible, high profile projects. His strategic capabilities and outstanding relationship skills are a tremendous asset. Tom’s high profile sports project experience, include the new Milwaukee Bucks arena, Golden State Warriors Chase Center, and Kyle Field Stadium Redevelopment at Texas A&M University.
Tom Bond, RA, AIA, LEED AP
President, PC Sports
With over $1 billion in projects managed to total more than three million square feet, Anthony Calabrese brings expertise and care to all projects. Anthony’s collaborative, solutions-based management style places importance on active listening with Owners and project teams. He carries this approach from project inception through Owner operation, affording client’s projects the highest level of valuable scope within budget, and a facility maintainable by the Owner. Anthony achieved a Bachelor’s from Devry University and a Master’s from Keller University in between serving three tours in Iraq as a US Navy Seabee.
Anthony Calabrese, PMP, LEED AP
Vice President, Project Control
Julia Clarke, PE
Associate, Geotechnical Engineering Department Manager
Susan leads Raba Kistner’s marketing team and is responsible for the firm’s branding, public relations and corporate communications. Joining Raba Kistner in 2018, Susan brings more than 25 years of experience in communications and marketing in the corporate and non-profit sectors, focusing on branding strategy, creative management, product development, content creation, and investor relations.
Susan Filyk, MBA
Corporate Director of Marketing
Mike serves as Raba Kistner’s strategic growth leader in the San Antonio and Austin marketplaces and oversee the regional growth of Raba Kistner’s four business lines across public and private sectors — engineering consulting, infrastructure, environmental, and project management. He has demonstrated executive leadership performance in planning, directing and overseeing large-scale engineering, infrastructure, water, wastewater, streets, storm water, and traffic management operations, with accountability for up to 1075 employees while managing large Annual Operating Budgets and Capital Improvement Programs.
Mike Frisbie, PE
Senior Vice President, Marketplace Leader for San Antonio & Austin
Steven has more than 40 years of professional experience, including 25 years with Raba Kistner. While he is an engineer, he is educated in both science and engineering and has professional experience in both disciplines. During his career, he has successfully managed a wide variety of projects that have required contributions from scientists, engineers, and professionals from non-scientific fields.
Steven W. Funderburg, PE
Vice President, Infrastructure
Jeff Haberstroh has accumulated over 30 years of experience as a Project Manager in the San Antonio region. Jeff holds extensive experience managing bond programs and construction projects for municipalities and school districts, including most recently leading the Project Control team on the Henry B. Gonzalez Convention Center and Alamodome expansion and renovations projects for the City of San Antonio. As a Program/Project Manager, he has managed all project phases from concept, contract negotiations and pre-construction services to complete bond oversight and project operations, to budget and schedule management.
Jeff L. Haberstroh
Vice President, Project Control
Dude has over 30 years of professional experience in the environmental field in both the government and private sector. Dude led Timber Creek Environmental (TCE), which was acquired by Raba Kistner in 2018. The firm was based in Conroe with additional offices in San Antonio and Dallas. Dude's leadership at TCE focused on supporting the manufacturing/industrial sector with major national clients. In Dude's current role, he is supporting the expansion of our environmental services in the Houston, Dallas-Fort Worth and San Antonio marketplaces, as well as across other regions and nationally for large clients.
Charles 'Dude' Hall
Director, Business Development
With over 30 years of experience, Gary Hall holds extensive knowledge and expertise in commercial, sports, and entertainment construction. A valued industry leader, Gary excels at bringing teams together on large, complex projects and doing so with integrity and respect. He currently represents Project Control and PC Sports as a Senior Vice President and is responsible for overseeing the Central Texas office. Gary received his Construction Science degree from Texas A&M University and was recently honored by his alma mater as an Outstanding Alumnus by the College of Architecture.
Gary Hall
Senior Vice President, Project Control
Justin serves as the Director of Accounting with over 20 years of combined experience in public accounting and industry. With a background in auditing, financial reporting and operational accounting roles, he leads the accounting team while providing financial and business support to the Company Leadership, Project Managers and their staff. Justin is an integral part in providing accurate and timely financial data, including project accounting analytics. He leads the implementation and upgrades of financial software, including ensuring the proper training and controls are in place. Justin earned a Bachelor's degree in Accounting from Southwestern University and is a licensed CPA.
Justin Hartshorn, CPA
Director of Accounting
As Regional Vice President, Adam leverages his broad industry understanding in his responsibilities of overseeing Midwest operations. His general contracting experience combined with his Owner and A/E/C industry relations allow him to successfully deliver projects. Adam believes the core tenants of a successful project lie in understanding client goals, thorough planning, working with the A/E/C teammates, detailed budgeting, frequent site visits, and analyzing the lifecycle costs.
Adam Hoebelheinrich
Regional Vice President, Midwest, Project Control
Gary is a Professional Engineer with extensive experience providing senior management for design and construction of major capital programs for infrastructure improvements as well as private development, with a thorough knowledge and understanding of industry practices and regulations. His project responsibilities have included the TxDOT IH-10 Katy Freeway Expansion, Harris County Metropolitan Transit Authority Downtown Midtown Streets, Harris County Toll Road Authority Sam Houston Toll Road, Houston Airport System IAH International Services Expansion Program, City of Houston Greater Houston Wastewater Program, and many more major projects across the U.S. and in the Middle East. Prior to joining Raba Kistner, Gary served as Associate Vice President, Construction Services at CP&Y in Houston.
Gary Hodges, PE
Vice President, Southeast Texas Infrastructure Services Line Leader
Howard has more than 25 years of experience in the development, delivery, construction and maintenance of transportation projects with the Texas Department of Transportation. Additionally he has 14 years engineering experience in diverse areas of water resources with USDA and land development in private practice. Howard's extensive expertise includes managing the activities associated with transportation planning, operations, right-of-way, design, construction, inspection, maintenance, safety, environmental, emergency operations and administrative support functions.
Howard Holland, PE
Vice President, Infrastructure
Frank Holzmann, PE
Associate Chief Operating Officer, Infrastructure
As Vice President, Andrew Hunt works alongside executives and community leaders from first imagination through construction completion of their facility projects. Whether moving a wall or building a campus, Andrew brings his high-energy passion and broad technical experience to leading teams through the planning, funding, design, and construction of clients’ projects. Andrew also leads our Strategic Asset Management service by providing tailored, strategic facility O&M advice. Andrew is a licensed Professional Civil Engineer, a Certified Facilities Manager, and a graduate of Texas A&M University.
Andrew Hunt, PE, CFM
Senior Vice President, Project Control
Bringing over 18 years of experience, EJ serves as a cross-department Geotechnical Consultant for Raba Kistner, concentrating in the transportation arena, with an emphasis on state and federally-funded transportation projects and other horizontal construction projects. In addition, he also works as a Senior Geotechnical Engineer or Senior Project Manager on assigned transportation-related geotechnical engineering projects, providing review of project reports and working closely with clients to make sure budgets and schedules are met.
Endeson 'E.J.' Juanda, PE
Vice President, Chief Geotechnical Engineer, Transportation
Rick has more than 25 years of diversified experience in geologic and hydrogeologic investigations and serves as the corporate discipline leader for geoscience services. He is responsible for implementing/overseeing site exploration and characterization activities in support of geologic/hydrogeologic investigations, geotechnical engineering, water resourcing planning, Edwards Aquifer protection, and environmental assessment objectives.
Rick Klar, PG
Vice President, Environmental
Tom is a licensed Professional Engineer with extensive experience in Civil Engineering and Construction Project Management. With over 25 years of experience, Tom has a proven record of improving quality, safety, customer satisfaction, productivity, and profitability through automation and process improvement. He is skilled in identifying areas of strength and weakness and establishing / implementing policies and standards.
Tom Kolko, PE
Vice President, Infrastructure
Katrin is recognized for her commitment to meeting client objectives for prompt and practical facilities engineering solutions. As an Associate with Raba Kistner’s Rio Grande offices, she has assumed progressive responsibility in management, administration, and coordination of geotechnical and facilities services throughout South Texas, the Texas/ México border, and Northern México. On a day-to-day basis, Katrin provides project management in several areas of facilities engineering.
Katrin Leonard, PE
Vice President, Rio Grande Valley Operations
Eric oversees the Geotechnical Engineering and Consulting projects for the San Antonio Engineering Unit. With more than 20 years of experience, he is responsible for scope development, financial management, and effectively allocating corporate resources for responsive client satisfaction. Eric has had the opportunity to provide geotechnical engineering services in the Midwest and in the San Antonio, Texas area. He has also been the geotechnical engineer and/or project manager on numerous new and rehabilitated pavement projects for the public and private sector.
Eric Neuner, PE
Division Practice Line Leader for Geotechnical Engineering
Martha provides financial, business and administrative support to the Company and Project Managers. She brings over fifteen years of experience in financial accounting in the Professional Service Industry. Martha has experience planning and directing treasury activities, financial forecasts, cash flow projections, formulation of budgets for project, overhead and capital expenditures as well as monitoring budget performance and revenues, recommendation of cost controls, and changes in billing multiplier rates to assure profitability of operations.
Martha Oseguera, MBA
Controller, Financial Reporting
Preston brings more than 20 years of experience in Construction Materials Engineering and Testing to Raba Kistner. He is responsible for overseeing Construction Materials Engineering and Testing projects in the San Antonio area. Preston has technical and managerial expertise in soils testing and inspection, foundation inspection, reinforcing steel placements, post-tensioning stressing inspection, structural steel inspection, asphalt pavements, and concrete plant and placement inspection. He performs engineering investigations and studies dealing with construction related issues.
Preston Parker, PE, PMP
Senior Vice President, Division Practice Line Leader, CoMET
Ian is responsible for client relationship development, and scoping geotechnical engineering investigations and construction materials testing opportunities in the New Braunfels area. Once procured, he is responsible for developing the action plan for any field activities, coordinating with key personnel both within and outside of our organization, and ensuring that the scope is fulfilled to the clients’ satisfaction. Ian serves as the primary point of contact for clients in the I-35 corridor between San Antonio and Austin before, during and after projects.
Ian Perez, PE
Vice President and Manager of San Antonio Geotechnical Engineering
Clark has over 26 years experience in Construction Construction Quality Managment, Construction Management & Engineering positions. He currently manages our Infrastructure business development for large projects pursued outside of Texas. He is also responsible for overseeing these projects as they are secured, while managing the Utah Division. Overall, Clark is responsible for 70 plus employees, 3 material testing labs, and development of our proprietary documentation software ELVIS.
Clark Prothero, PE, CMQOE
Senior Vice President, Infrastructure
Ben brings more than ten years of experience in inspection management to Raba Kistner. Mr. Reese is responsible for overseeing Construction Materials Engineering and Testing projects in the San Antonio area. He has technical and managerial expertise in soils testing and inspection, foundation inspection, reinforcing steel placements, structural steel inspection, asphalt pavements, and concrete plant and placement inspection. He works closely with architects, engineers, contractors, owners, and developers on various types of projects.
Ben Reese, PE
Division Quality Officer
Through collaboration and building consensus, Merrill Stanley approaches each project with excitement for transforming an Owner’s vision into reality. His involvement in creating facilities that have a meaningful impact upon the community is truly humbling, one that he considers a privilege and an honor. Merrill brings over 22 years of significant healthcare project management experience to his role as Vice President of Healthcare. Merrill is a graduate of The University of Texas at Austin and Texas State University.
Merrill Stanley
Vice President, Project Control
Scott is President of Drake Environmental, LLC, a division of Raba Kistner, which offers a complete range of environmental compliance and construction services. Drake's total focus is Stormwater/SWP3 protection & management, including Erosion & Sediment control. They serve all phases including design, development, construction & post-construction. Drake's customers include large & small Commercial & Residential General Contractors, Developers, Utility Companies, Energy Companies, Civil Engineers, Municipalities, Heavy Highway and Civil Constructors. Drake has been trusted with SWP3 contracts on more than $5 billion in projects since 2014. Drake has offices in College Station, Houston & Austin Texas.
Scott Story
Director, Environmental Construction and Compliance Services
Caleb Swanson’s experience includes serving as an owner’s representative and project manager on building and infrastructure projects throughout Nebraska. He appreciates developing trusting relationships with his clients while simultaneously helping revitalize and improve communities through redevelopment. Caleb’s expertise lies in public and municipal projects, where he enjoys bringing together the multiple stakeholders inherent in these projects to make lasting impacts on the communities where they reside.
Caleb Swanson
Vice President, Project Control
Yvonne is responsible for the management, administration, coordination, and reporting of a variety of geotechnical engineering projects throughout Texas, with a primary focus in north and central Texas regions. As a geotechnical engineer, her responsibilities include subsurface investigations and engineering analysis and consulting of the design and construction of foundations, pavements and roadways. She has consulted on various foundation and pavement design recommendations for residential, commercial institutional, schools, industrial projects, as well as infrastructure.
Yvonne G. Thomas, PE
Vice President, Austin Marketplace
As the Cultural Resources Program Director, Dr. Tomka is responsible for all Cultural Resources activities of the firm. He works closely with Prehistoric and Historic Project Archaeologists and Field and Laboratory Technicians to complete archaeological projects. He has more than 35 years of experience in archaeology. Dr. Tomka has authored 60 cultural resource management reports, peer-reviewed 23 journal articles, and delivered 27 papers at national and international meetings in his areas of expertise.
Steve A. Tomka, PH.D, RPA
Cultural Resources Program Director
Elliot has over 15 years of professional experience within the environmental field, serving as both a public agent and environmental consultant. His career has primarily involved leading teams of environmental consultants and engineers, where he's managed and developed business units that primarily service industrial clients. In Elliot’s current role he is leading the growth of development of his team’s capabilities, service offerings and clients.
Elliot Townsend, CRAME
Director, Environmental Compliance Services
Martin has over 30 years of engineering experience and has supported Raba Kistner’s clients since 1994. As Senior Vice President, he oversees Raba Kistner’s consulting operations in the Houston area. He is responsible for the management, administration, and coordination of geotechnical, environmental, construction materials engineering and testing, forensic, and due diligence studies. Martin oversees infrastructure, transportation, healthcare, commercial, industrial, and residential projects.
Martin Vila, PE, F. ASCE
Senior Vice President, Houston Region
Devin brings over 20 years of sales and marketing experience to Raba Kistner. His primary responsibilities include establishing and managing client relationships throughout the Central Texas region covering New Braunfels and the IH-35 corridor, along with participating in project development for geotechnical engineering, construction materials testing, environmental and cultural services, and building science services. These responsibilities have overlapped to our sister company, Project Control, since he helped launch the Austin office in 2016, which provides project and program management services.
Devin Williamson
Senior Director - Business Development
David’s primary duties consist of facilities project management with emphasis on scope development, budget estimates, roofing inspection reports, surveys, roofing redesigns, and engineering solutions with attendant specifications. He actively serves as the client’s trusted advisor by planning, staffing, and executing projects involving roofing and building forensics services. Additionally, David oversees project management tasks covering roofing consulting and design work. He monitors the professional practice of his staff, including QA/QC protocols, and ensures compliance with generally accepted policies.
Vice President, Building Sciences
Newel has extensive experience managing civil engineering and construction projects. As Vice President, he takes on substantial managerial responsibilities for our work on infrastructure projects. Newel has been involved in the execution of the some of the largest projects performed in the Western U.S. including the $1B South Mountain Freeway, $1.5B City Creek Center and the $1.1B Utah I-15 Corridor Expansion. His roles included management of quality plans, inspection programs, and materials testing, off site fabrication inspection, design review and construction engineering.
Newel White, PE
Vice President, Infrastructure
Doug serves as Raba Kistner’s strategic growth leader in the North Texas marketplace and oversee the regional growth of Raba Kistner’s four business lines across public and private sectors — engineering consulting, infrastructure, environmental, and project management. He has executive experience leading a comprehensive municipal Transportation & Public Works department encompassing transportation programming, street maintenance, traffic management, environmental management, stormwater management, capital project delivery, facility management, and parking management. Doug has managed annual operating and capital programs of over $315 million, a roadway system of 7,767 lane miles, 437 bridges and 890 traffic signals and led major efforts including the development of capital and maintenance programs and two $500 million bond programs.
Doug Wiersig, PE
Vice President, Marketplace Leader for North Texas
As Director of Cultural Resources, Ms. Ward is responsible for the management and coordination of the RKI cultural resources program. Her responsibilities include developing and maintaining client relationships, budget and proposal preparation, developing research designs, permitting, and directing field operations. She works closely with clients and oversight agencies to develop project scopes for regulatory review under federal, state, and local compliance, including the Texas Antiquities Code and the City of San Antonio’ Unified Development Code. Ms. Ward has 14 years of experience in cultural resources compliance, specializing in historic and Spanish Colonial archaeology.
Rhiana Ward
Director, Cultural Resources
Blake has worked with staff, architects, consultants, subcontractors, and other project team members to provide professional consulting services with passion and integrity. He will capably continue enhancing the San Antonio CoMET department’s reputation of excellence. Blake exemplifies our Raba Kistner core value of community by giving back to our profession through involvement in professional organizations, teaching new generations studying construction and engineering, and serving in the United States Navy Reserve.
Blake Wright, PE
Vice President, Construction Materials Engineering & Testing