A picture of rainbow over a waterfall
Tyler H. Vanderhoef, J.D.

Tyler H. Vanderhoef, J.D.

Owner and President of multiple small businesses with over 15 years’ experience in the energy and natural resource industries. Licensed Wyoming Attorney skilled in Administrative, Natural Resource and Water Law. Holds a Bachelor of Science degree in Petroleum Engineering.

Bonnie S. Percy, P.E.

Registered Professional Engineer skilled in practical reservoir engineering, hydrology, environmental engineering, numerical simulation, pressure transient analysis and as an expert witness for state hearings. 

Christian J. Vanderhoef, P.E.

Registered Professional Engineer experienced in oil and gas regulatory compliance, underground injection control, expert witness testimony, pipeline design, hydraulic simulations, environmental engineering, and
civil engineering.


Cynthia L. Madison

Extensive knowledge of the Wyoming Department of Environmental Quality (WDEQ)/Air Quality Division (AQD) permitting program for Oil and Gas Production Facilities. Working knowledge of environmental principles, theories and practices of environmental compliance and regulations for the oil and gas production industry. Engineering/scientific and practical background.

Mark W. Knoll

Geoscientist with over 40 years experience in coal, uranium, oil and gas exploration and development. Skilled in complex geographic, geologic, and engineering mapping and analysis.