John A. Clendening

Tengasco, Inc. operates as an independent oil and gas company. It explores, develops and produces domestic oil and natural gas reserves. The firm also deals with well drilling activities. The company was founded in 1916 and is headquartered in Greenwood Village, CO.

The Society for Organic Petrology operates as a non profit organization for scientists and engineers involved with coal petrology, kerogen petrology, organic geochemistry, and related disciplines. The firm's objectives include promoting research in organic petrology among members and among scientific disciplines; providing educational opportunities in organic petrology; working for acceptable classifications of all types of sedimentary organic matter; promoting state-of-the-art technologies in organic petrology; and enhancing professional and scientific interactions among all scientists and engineers. The company was founded in 1984 and is headquartered in Vancouver, Canada.