Abraxas Petroleum Corp. (NASDAQ: AXAS) on Sept. 20 announced a change in leadership roles.

William H. Wallace has resigned as vice president of operations to pursue other career opportunities. The board of directors of Abraxas has appointed Kenneth W. Johnson, currently Abraxas’ regional operations manager, as the new vice president of operations.

Johnson is a tenured member of Abraxas’ management team and has managed various operations at Abraxas and its predecessor companies since 2000. Prior to Abraxas, Johnson served as a consultant to various operators in supervisory and operations management roles across the U.S. including the Mid-Continent, Rockies, and Gulf Coast regions.

“We are pleased that we are able to make a smooth transition as part of our ongoing planning and development initiatives,” Bob Watson, president and CEO, said.

Abraxas Petroleum Corp. is a San Antonio based crude oil and natural gas exploration and production company with operations across the Permian Basin, Rocky Mountain, and South Texas regions of the U.S.