William F. Chatham

Laredo Petroleum, Inc. is an exploration and production company with headquarters in Tulsa, Oklahoma. Laredo's strategy is to make strategic acquisitions and participate in drilling joint ventures having upside potential in the targeted area of the Mid-Continent and Permian Basin Regions of the United States. The company was founded in May 2007 and is headquartered in Tulsa, OK

Staghorn Energy LLC explores oil and gas properties. The firm specializes in the acquisition and exploitation of marginal producing properties. The company was founded on June 26, 2006 and is headquartered in Tulsa, OK.

Latigo Petroleum, Inc. explores and develops oil and gas. It conducts exploration and development drilling programs and makes strategic acquisitions in its targeted area of the Mid-Continent Region of the United States. The firm's targeted area includes the Permian, Anadarko and Arkoma basins located in Texas, New Mexico, Oklahoma and Arkansas. The company was founded in 1996 by Randy A. Foutch and is headquartered in Tulsa, OK.

Part of ConocoPhillips, Burlington Resources Oil & Gas Co. LP is a company that engages in oil and gas exploration and natural gas production services. The company is based in Dallas, TX.

Liberty Oil & Gas Ltd. explores, produces and develops oil and gas properties. The company is headquartered in Calgary, Canada.

Part of Chesapeake Energy Corp., Chesapeake Energy Marketing, Inc. provides business consulting services.