Knowledge / Skill / Experience

Our People

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C.H. Scott Rees III
Executive Chairman
Scott Rees has been with NSAI since 1988 and has over 40 years of oil and gas experience. He was promoted to President and COO in 2002, Chairman and CEO in 2008, and Executive Chairman in 2022. Since joining NSAI he has been involved in hundreds of projects both domestically and around the world, including Latin America, Mexico, Australia, and West Africa. He is actively involved in all aspects of the business, including the application/interpretation of industry reserves definitions and guidelines. Scott began his career at Exxon Company, U.S.A. and has a B.S. in Mechanical Engineering from University of Florida.
Danny Simmons
Danny D. Simmons
Executive Chairman
Danny Simmons joined NSAI in 1976 and has managed the company's Houston office since it opened in 1993. He was made President and COO in 2008 and Executive Chairman in 2022. Danny is experienced in all major producing basins of the United States and in selected areas of Australia, Canada, China, South America, West Africa, the Middle East, and the North Sea. His experience includes conventional, tight sand, and CBM as well as presentation of expert testimony in court and regulatory agency hearings. Danny started his career with Exxon Company, U.S.A. and has a B.S. in Mechanical Engineering from University of Tennessee.
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Richard B. Talley, Jr.
Chief Executive Officer
Rick Talley joined NSAI in 2004 and had over 23 years of oil and gas experience when he was promoted to Chief Executive Officer in 2022. He has significant experience with preparing reserves evaluations for conventional and unconventional assets in most major onshore United States producing basins, as well as Gulf of Mexico and international properties. Rick began his career at ExxonMobil Production Company and has a B.S. in Mechanical Engineering from University of Oklahoma and an M.B.A. from Tulane University.
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Eric J. Stevens
President and Chief Operating Officer
Eric Stevens joined NSAI in 2007 and had over 20 years of oil and gas experience when he was promoted to President and Chief Operating Officer in 2022. Eric has extensive experience in the evaluation of oil and gas fields located in Central and South America, West Africa, and the United States. He started his career as a reservoir engineer and development planner with ExxonMobil Development Company and holds a B.S. in Mechanical Engineering from BYU.

NSAI specializes in projects encompassing multiple disciplines. Our technical staff includes reservoir and operations engineers, petrophysicists, and geoscientists who are generally cross-trained in geology and geophysics. We also employ staff specializing in geologic modeling, reservoir simulations, complex computer mapping, and non-routine time-to-depth conversion. We apply the right combination of people, expertise, and technology to each assignment.

Our present organization consists of approximately 55 reservoir engineers, geoscientists, and petrophysicists; 65 engineering and geologic analysts; and additional support staff. Our technical staff is carefully recruited from the industry’s most qualified candidates. The average experience level of these individuals exceeds 20 years, including 5 to 15 years with a major oil company. Most of our engineers, geoscientists, and petrophysicists obtained their initial training and experience with BP, British Gas, Chevron, ConocoPhillips, or ExxonMobil. We recruit only those with the right combination of academic excellence, sound judgment, intuitive skills, relevant experience, and an understanding of the critical relationship that exists between the petroleum and financial industries.

Members of our technical staff are listed below, along with brief bios and contact information.


Craig H. Adams Dallas Senior Vice President
Robert C. Barg Dallas Senior Vice President / Executive Committee
P. Scott Frost Dallas Senior Vice President / CFO / Executive Committee
Randolph K. Green Dallas Senior Vice President
John G. Hattner Dallas Senior Vice President / Executive Committee
Kara Sue Logan Dallas Senior Vice President
Derek F. Newton Houston Senior Vice President
Joseph J. Spellman Dallas Senior Vice President / Executive Committee

Our staff of petroleum analysts are integral to each evaluation, working closely with the engineers and geoscientists and with our clients. They generally have 3 to 15 years experience and have degrees in mathematics, computer science, geology, or business. They have diverse skills in data loading, database management, economic modeling, spreadsheet manipulation, computer mapping, well log processing, and report preparation. Listed below are our Engineering and Geology Analyst Coordinators:

Amy H. Arnold Dallas Contact
Dina S. Blair Dallas Contact
Jake S. Bontrager Dallas Contact
Nick A. Brown Houston Contact
Diana E. Castillo Houston Contact
Daniel C. Clements Dallas Contact
Sabrina M. Dechene Houston Contact
Ely A. Dlugos Dallas Contact
Levi E. Enslow Dallas Contact
Lisa R. Green Houston Contact
Maddie B. Gulick Dallas Contact
Sean T. Henson Houston Contact
Alayna M. Hoenig Dallas Contact
Natalie F. Hudson Houston Contact
Shannon R. Mapes Houston Contact
Heather R. Maresh Houston Contact
Cristie L. Moss Dallas Contact
Ram Shoham Houston Contact
Dawn S. Smith Dallas Contact
Michael S. Strohmann Houston Contact
Michelle M. Walts Dallas Contact
Julie C. Wilburn Dallas Contact