Help Us Celebrate!

The year 20223 is a special one for Collier – it marks our 25th anniversary! 

In 1998, Hughbert Collier decided to leave academia and pursue consulting full time. Thus, Hughbert and Gail founded Collier Consulting, Inc. The company had humble beginnings as Hughbert and Gail officed out of their home kitchen. The first employees were some of Hughbert’s recent students from Tarleton State University. These few employees were officed our of an adjacent carriage house and would make frequent trips in and out of the house. Some projects were even completed using the dining room table. 

In 2006, Collier Consulting moved out of the kitchen into an office building. With sustained growth the company steadily outgrew that building. In 2013, Hughbert and Gail purchased The Stephenville Empire Tribune’s (town newspaper) building and moved in. In the period from 2016 to 2022, Collier Consulting experienced some it most significant growth. The company doubled in size from approximately 20 to over 50 employees. The Collier Family started a sister company, Collier Geophysics, in 2018. Since then, they have expanded out of Texas and now have offices in Colorado, Georgia, Massachusetts, North Carolina, Tennessee, and Wisconsin.



Looking back on 25 years – Collier Consulting is thankful to be celebrating our 25th anniversary! This milestone has been made possible because of the clients we have had the privilege to serve and the outstanding, dedicated scientists and engineers who have been part of the Collier Consulting family. Our firm incorporated in 1998, but its roots go back another 25 years – to graduate schools at Mississippi State and UT Dallas, teaching tenures at Abilene Christian University and Tarleton State University, a Texas Water Development Board research project, and work experience as a petroleum geologist in Abilene, Texas. Honestly, Gail and I never started out to have a consulting company; it was the furthest thing from our minds. Our goal was to continue teaching at a university and consulting part-time, but opportunities and challenges opened the door for full-time consulting. What started out as “offices” in the corner of our kitchen has evolved to where we are today. All of this has only been possible because of the trust, support, and mentorship of so many clients, associates, friends, and family. We are extremely thankful to God for His blessings and for all of you! We are grateful for the opportunities afforded to us over the past 25 years and look forward to opportunities that are on the horizon. We are excited for and confident in how the next generation of the Collier Consulting family will continue to serve!

– Hughbert & Gail Collier

Collier is pleased to announce Gretchen Miller, Ph.D., P.E., as the newest member of the Collier Team. She joins the Round Rock Office as a Senior Groundwater Engineer. Previously, she was an associate professor of water resources engineering in the Zachry Department of Civil Engineering at Texas A&M University, where she taught fluid dynamics and groundwater engineering for thirteen years. Gretchen has a B.S. and M.S. in Geological Engineering from the Missouri University of Science and Technology and a doctorate in Environmental Engineering from the University of California at Berkeley. She has expertise in hydrogeology, well hydraulics and design, aquifer storage and recovery, manager aquifer recharge, and numerical modeling of groundwater flows. 

Gretchen is a member of the National Groundwater Association, American Society of Civil Engineers, and the American Geophysical Union. She has served on multiple groundwater-related advisory boards and peer review panels for local, state, and federal agencies. She is registered as a professional engineer in the state of Texas. 



Gretchen can be reached at: 

Office: (512) 851-8740

Cell: (979) 676-1273

Collier will be attending numerous conferences and conventions! Check out below who will be presenting, speaking on panels, and exhibiting! We look forward to seeing you! 

  • Association of Environmental & Engineering Geologists 65th Annual Meeting – Las Vegas, NV. September 12-16
    • Exhibit Booth # 28
      • Doug Laymon, P.G. 
    • Speakers: 
      • Mario Carnevale, P.G.
        • Why Not Geophysics? 
        • September 15 @ 8:00 am, Room Sunset 3-4
      • Roy Bowling 
        • Applying Seismic Velocity Mapping for Landslide Shear-plan Identification, Theodore Roosevelt National Park 
        • September 15 @ 9:20 am, Room Sunset 3-4
  • National Ground Water Association Fractured Rock Conference – Burlington, VT. September 12-13
    • Sponsorship – Tabletop Exhibit 
      • Jon Algeo, Adam Belkadi, Cosimo Martelli, Charl du Toit, Mario Carnevale, and John Jansen
  • GeoCarolinas – Charlotte, NC. September 12-13
    • Speaker: Phil Sirles 
      • Project Risk Reduction: An Interview Viewpoint for the Modern Application of Geophysics as a Project Resource 
      • September 12
  • CECON 2022 – Frisco, TX. September 14-16
    • Exhibit Booth # 43
    • Speaker: Doug Laymon, P.G. 
      • Using Geophysical Tools in Texas to Assess Potential Geohazards to Assist in Design & Construction 
      • September 16 @ 8:00 am 
  • Dam Safety – Baltimore, MD. September 18-22
    • Exhibit Booth # 724
      • Nathan Collier, P.E. & Doug Laymon, P.G. 
  • Groundwater Resources Association Western Groundwater Congress– Sacramento, CA. September 19-21
    • Speaker:
      • John Jansen, Ph.D., P.G., P.Gp.
        • Managed Aquifer Recharge – The Project of the (Near) Future Session 
          • September 18 @ 10:30 am  
      • Kristen Marberry 
        • Near-Surface Geophysics Resources Applications Session 
          • September 19 @ 10:00 am


Collier Geophysics (Collier) is pleased to announce the acquisition of New England based Hager GeoScience (HGI). HGI has provided exceptional consulting services in geology and geophysics throughout the United States and internationally for over 29 years. We would like to recognize owners Jutta Hager and Mario Carnevale for building such an amazing company. We are honored that HGI has entrusted Collier to take over their legacy and carry it forward into the next generation. 

Through the addition of HGI, Collier has expanded its national presence into the Northeast. The merger of these two companies is a vital step in Collier’s mission to provide nationwide geoscience and geophysical services. Jutta and Mario will continue to lead the HGI office and provide the same high-quality service to their clients. HGI will also now be able to offer expanded surface, borehole, marine, and airborne geophysical services through Collier’s national network. 

Collier is excited to continue building a nation-wide company that is centered on professionalism, exceptional science, a team-focused environment, and top-notch customer service.


Collier Geophysics (Collier) and Aqua Geo Frameworks, LLC (AGF) are excited to announce a strategic alliance between our companies. This alliance allows a formal collaboration between Collier’s surface, borehole, and marine geophysical expertise and AGF’s airborne electromagnetic (AEM) investigations. This alliance provides for an industry leading set of expertise between the two organizations. Over the years, the large-scale AEM projects have needed fill-in and ground-based geophysical surveys to provide clients with a complete geologic framework for their project needs.

The experience brought together by Collier and AGF staff offers tremendous breadth and depth from geologists, hydrologists, geophysicists and engineers to solve complex hydrologic and geologic problems. Additionally, the scale-factor to acquire townships worth of data with AEM, follow-up with the mobile Wallaby TEM array, or any other variety of geophysical methods, gives this alliance an edge to working at any level of project size desired.

With the ever-increasing demand for water resources, we believe this alliance will give federal, state, city and water district managers the value to select how and why particular methods are applied for their projects. This team provides a powerful combination of AEM and ground-based geophysical surveys including exploration for water resources, aquifer characterization, managed aquifer recharge, and environmental site characterization. With both Collier and AGF’s broad experience across the world, our alliance brings both our clients a collective team with unparalleled skill and experience.

Collier is excited to announce the opening of our new office in Atlanta, Georgia. We are please to welcome Jorgen Bergstrom, P.Gp. to the team as our out Atlanta Operations Manager! Mr. Bergstrom has over 25 years’ experience in geophysical methods and instruments in the United States and Europe. During his career, he has conducted numerous geophysical investigations assisting clients with subsurface characterization. These investigations have involved using geophysical methods such as ground penetrating radar (GPR), borehole and surface radar tomography (RT), resistivity, seismic, magnetic, electromagnetic, and acoustic. Mr. Bergstrom also provides geophysical borehole logging services, for a number of applications, to assist clients determine structure, fracture orientations, and fluid flow in rock. He has authored numerous publications discussing various geophysical technologies. 

Mr. Bergstrom is involved in the Environmental and Engineering Geophysical Society and the Society of American Military Engineers. Welcome to the team Jorgen! 

Jorgen can be reached at:

Office: (254) 968-8741

Cell: (770) 543-8444

Collier is pleased to announce Theodore Stieglitz, Sr. Geophysicist, as the newest member of the Collier team. Ted has over 25 years of experience as an oil and gas exploration geophysicist. 

Ted began his career in environmental geophysics and transitioned to oil and gas after pursuing his PhD at Rice University. He has experience in a variety of R&D, business development and operational roles working for both the oil and gas industries and for seismic vendors, including the Hess Corporation, Spectrum Geo, EMGS, Veritas and ION. Ted is an expert in depth imaging and model building. He has broad 2D and 3D experience supporting several world class seismic libraries spanning numerous basins around the world. He believes strongly in the holistic integration of the Earth model through data acquisition, imaging and interpretation. He was a founding partner of Agile Seismic LP and has served as a consultant to many domestic and international clients. 

Ted is a member of the Geophysical Society of Houston and the Society of Exploration Geophysicists where he actively serves on the SEG Finance Committee. He is licensed to practice in the State of Texas. 


Theodore can be reached at:

590 E South Loop Stephenville, Tx. 76401

Office: (254) 968-8741

Cell: (713) 569-4603


Collier Consulting and Collier Geophysics are excited to announce that we are attending in person conferences and events once again. We are bringing to you new services, staff, and information! Listed below are the conferences we will be attending in September. In addition, we have multiple team members speaking and exhibiting at events. Keep an eye out for the Collier logo!

  • Texas Groundwater Summit 2021 in San Antonio, Texas
    • Exhibit booth # TBA
  • AGSD DAM Safety 2021 in Nashville, Tennessee 
    • Exhibit booth # 721
  • Water Pro Conference in Milwaukee, Wisconsin 
    • Exhibit booth # 935
  • 4th Annual GRA Western Groundwater Conference 2021 in Los Angeles, California 
  • 33rd Annual AHS Symposium in Tempe, Arizona
    • John Jansen will be speaking on Rapid screening of potential MAR sites using a towed-cart time-domain electromagnetic induction system. 
  • CECON 2021 in San Marcos, Texas 
    • Exhibit booth # 52
  • Association of Environmental & Engineering Geologists 64th Annual Meeting in San Antonio, Texas
    • Exhibit booth # 2
    • Phil Sirles will be speaking on Seismic and Electrical 3D Geophysical Imaging for Landslide Remediation and 3D Geophysical Investigation to Evaluate Risk at Karstic Wind Turbine Foundation Sites. 
    • Trever Ensele will be speaking on Thru-Dam Seismic Tomography. 
    • Doug Laymon will be speaking on Imaging and Mapping of Karst Features.

Collier Consulting is pleased to announce that Kenny Weldon, Senior Director of Government Programs, as the newest member of the Collier team. Kenny has 36 years of results-oriented leadership experience in facility life cycle planning, environmental management, and government systems.

Kenny’s experience includes executive-level positions in government, higher education, and the private sector. 

He retired from active duty, as a Colonel, following more than 26 years as an Air Force civil engineer officer where he held multiple command positions and served as a senior policy advisor at the Under Secretary of Defense-level. During Kenny’s career, he was responsible to provide facility life-cycle management, construction services, environmental management and emergency response. 

While serving as mayor, he successfully led an effort to implement a municipal economic development authority for the City of Stephenville and established the first-ever life-cycle facility plans for the city-including pavement management, water resource, and capital improvement plans. 

His federal, multi-agency experience is extensive, including executive program lead for the Department of Defense’ policy and implementation of joint basing at 12 multi-service installations; senior manager of a life-cycle plan for the Air Force’s 65,000-unit housing inventory; and senior project manager for a $38 million construction program to bed down the first operational F-22 fighter squadron. 

Kenny’s work  with environmental management is also very broad. Kenny was responsible for multi-media environmental regulatory compliance at 13 major military installations in five states. He paved way for the Department of Defense Fire Academy air and water permits and developed storm water pollution plans for 11 Air Force installations to comply with the Clean Water Act. 

Kenny currently serves on several regional and local boards, including the Brazos Region G Water Planning Group and Workforce Solutions for North Central Texas.

Kenny can be reached at: 

590 E South Loop 

Stephenville, Tx. 76401

Office: 254-968-8741

Cell: 254-459-0867


Collier Consulting is pleased to announce Brad Cross, Sr. Hydrogeologist, as the newest member of the Collier team. Brad has 35 years of experience in the field of underground injection control, hydrogeologic studies, environmental assessments, and project management.

Brad’s experience at the TCEQ for 15 years spans development rules, regulations, guidelines associated with Underground Injection Control, Public Drinking Water, Waste Management, and Non-Point Source Pollution. He served as a permit writer for Class I and Class V injection well areas and as a program manager for the Class V injection well program. Brad has served as Division Chair for the Ground Water Protection Council (formerly) known as the Underground Injection Practices Council), and has served as a consultant to the U.S. Environmental Protection Agency, Washington, D.C. in development of regulatory guidelines for the 1996 Amendments to the Safe Drinking Water Act.

Brad can be reached at:

1205 Sam Bass Rd. 
Bldg. B., Ste 300
Round Rock, TX 78681 

Office: 512-851-8741
Cell: 512-619-9835