Abraxas Petroleum named Kenneth W. Johnson VP of operations, replacing William H. Wallace, who has resigned from that position to pursue other career opportunities. Johnson previously served as regional operations manager and has managed various operations at Abraxas and its predecessor companies since 2000. Prior to Abraxas, he served as a consultant to various operators in supervisory and operations management roles across the US including the Mid-Continent, Rockies, and Gulf Coast regions.