William Ulrich

Atlas Resource Partners LP is an exploration and production master limited partnership. It develops and produces natural gas, crude oil and natural gas liquids, with operations in basins across the United States. The company also sponsors and manages tax-advantaged investment partnerships, in which it co-invests, to finance a portion of natural gas and oil production activities. It also operates its business through following segments: Oil & Gas production, Well construction & completion and Other partnership management. Atlas Resource Partners was founded in October 2011 and is headquartered in Pittsburgh, PA.

Atlas Growth Partners LP engages in the production of natural gas and oil. It focuses on the development and growth of energy enterprises. The company was founded in February 2013 and is headquartered in Philadelphia, PA.

Presidio Investment Holdings LLC is an investment company, which engages in the acquisition and operation of oil and gas properties. The company was founded by Chris Hammack and William Ulrich and is headquartered in Fort Worth, Texas.

Presidio Petroleum LLC engages in the operation and acquisition of developed assets that focus on operations optimization and technology. The company was founded by Christopher L. Hammack and William Ulrich and is headquartered in Fort Worth, TX.