History
When P. Jon Wilems founded Gas Supply Consulting, Inc. in 1991, He was dedicated to providing the highest quality consulting services available in the rapidly changing natural gas industry. The basic principles were to reduce costs, ensure supplies & services were reliable and simplify supply management for the client. Tim Sexton joined GSC in 1994 and became president in 2010. We still operate with the philosophy that there is no substitute for integrity, honesty and hard work. You will see that in the quality of our staff…professionals with the experience and determination to get the job done for you.
Over the years, GSC has helped our clients save millions of dollars in energy costs. We have negotiated contracts that account for over 5 Bcfd of flowing gas and 2 Bcfd of LNG feedgas. Our services extend beyond supply planning and acquisition, to risk management and infrastructure analysis. We are able to help global partners entering the domestic industry. Our knowledge in rates and pipeline services have helped many municipal utilities, industrials and generators manage energy costs and services more effectively.
Get in touch
Gas Supply Consulting is proud of the longevity of its clients and business associates. We maintain good relationships throughout the industry, which we utilize on behalf of our client partners to help them achieve their goals.
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GSC Professionals
President
Tim Sexton
Tim joined the company in 1994, assuming ownership and the position of President in 2010. As a former pipeline engineer, he brings a great deal of technical knowledge to the table. His background in market development, commercial negotiations and regulatory support provides clients with a broad understanding of the multi-faceted energy industry to assist in negotiations and strategy formulation. Mr. Sexton is well versed as an expert witness and is a licensed Professional Engineer in the state of Texas.
Education
University of Texas Austin, TX
B.S. Civil Engineering, 1989
University of Houston
Masters of Business Administration, Finance Concentration, 1993
consultant/engineer
Jimmy Francis
Jimmy joined Gas Supply Consulting, Inc. (“GSC”) in 2025 and has over five years’ experience in the oil and gas industry. He brings a technical and commercial background rooted in chemical engineering and natural gas market experience. Jimmy’s work spans across project development, client engagement, and analytical support within the natural gas and broader energy sectors.
Education
University of Louisiana Lafayette, LA B.S. Chemical Engineering, 2019
Consultant/Engineer
Charles I. Azih
Charles joined the company in 2022 with ten years experience in the oil and gas industry. He brings a diverse background with him from data analytics, upstream operations and design engineering. He’s led cross functional engineering teams on small/large scale projects, risk assessment, performance evaluation and project planning.
Education
Texas Tech University Lubbock, TX B.S. Mechanical Engineering, 2010
University of Tulsa Tulsa, OK Masters of Energy Business, 2020