Founded in 2018, Collier Geophysics has assembled one of the most respected and experienced team of geophysicists in the United States. Commitment to our clients, professional integrity, and loyalty to one another are the things we value most.
Our President

Major Nathan Collier, P.E., is President of Collier Geophysics, a service-disabled, veteran-owned, small business (SDVOSB) in Stephenville, TX.
Major Collier attended the United States Military Academy at West Point, Class of 2007. His class has the distinction of being the first to fully begin the Academy’s admission process after September 11, 2001. At West Point, Major Collier played as an offensive lineman and lettered for Army Football. Upon graduation with a BS in Engineering Management, he was commissioned as a 2nd Lieutenant in Field Artillery.
Major Collier served on active duty for eight years, including assignments to Grafenwöhr and Schweinfurt, Germany, Schofield Barracks and Fort Shafter, Hawaii, and Fort Sill, Oklahoma. He served in a multitude of roles including Battery Commander, Fire Support Officer, Executive Officer, Platoon Leader, and Future Operations Planner.
Major Collier was deployed in support of Operation Iraqi Freedom ’08- ‘09, Operation Enduring Freedom ’11 and Operation Foal Eagle ‘14 in South Korea. Major Collier’s military decorations include the Bronze Star Medal, Army Meritorious Service Medal, Parachutist Badge, Air Assault Badge, and Pathfinder Badge.
Major Collier continues to serve as an Engineer Officer in the Texas Army National Guard.
Our Staff

Nathan Collier
P.E.
President

Hughbert Collier
Ph.D., P.G.
Sr. Vice President

Aaron Collier
P.G.
Vice President

Jorgen Bergstrom
P.Gp.
Sr. Geophysicist/Operations Manager

Roy Bowling
Geophysicist

William Doll
Ph.D.
Sr. Geophysicist / Federal Market

Trever Ensele
Sr. Geophysicist

John Jansen
Ph.D., P.Gp., P.G.
Sr. Geophysicist / Hydrogeologist

Doug Laymon
P.G.
Sr. Geophysicist / Operations Manager

Kristen Marberry
Hydrogeophysicist

Finn Michelsen
P.G.
Sr. Geophysicist

Juan Ortega
P.G.
Geophysicist

Nicole Pendrigh
Sr. Geophysicist

Jim Pfeiffer
P.Gp., P.G.
Sr. Geophysicist

Ted Powell
P.G.
Sr. Hydrogeologist / Geophysicist

Nicholas Rebman
Geophysicist

Phil Sirles
Sr. Geophysicist / Operations Manager

Theodore Stieglitz
Ph.D., P.G.
Sr. Geophysicist

Evan Walston
Comptroller

Kenny Weldon
Senior Director of Government Programs