Alta Mesa Resources CEO Hal Chappelle, COO Michael Ellis Resign

Alta Mesa Resources Inc. (NASDAQ: AMR) said Dec. 20 that CEO Hal Chappelle, as well as COO Michael E. Ellis, are stepping down from their positions at the pure-play Stack company.

James Hackett, executive chairman of the board, has been named interim CEO of Alta Mesa. Hackett, the well-respected former board chairman and CEO of Anadarko Petroleum Corp. (NYSE: APC), has been with Alta Mesa since the merger of blank-check vehicle Silver Run II with the company and Kingfisher Midstream LLC closed February 2018.

In addition, the leadership team of private equity portfolio advisory firm Meridian Energy LLC has agreed to fill out the remaining C-Suite positions. As a result, Randy L. Limbacher will serve as Alta Mesa’s president, John H. Campbell will serve as the COO of the company’s upstream business and Mark P. Castiglione will serve as the chief of staff to the president on a consulting basis.