Alta Mesa Resources Inc. (NASDAQ: AMR) said Jan. 7 that John C. Regan, a former executive of Vine Oil and Gas LP and Quicksilver Resources Inc., had been appointed as its new CFO.

Regan joins Alta Mesa with more than 25 years of experience in the energy, finance and accounting sectors. He previously served as CFO of private-equity-backed Vine Oil and Gas, which he had joined following his resignation as CFO of Quicksilver Resources in late 2014.

The appointment is the latest in a string of changes to Alta Mesa’s C-Suite following the resignation of CEO Hal Chappelle and COO Michael E. Ellis on Dec. 20.

The company’s recent leadership changes include James Hackett, executive chairman of the board, assuming the role of interim CEO. The executive team of private equity portfolio advisory firm Meridian Energy also filled out the remaining positions.

RELATED: Alta Mesa Resources CEO Hal Chappelle, COO Michael Ellis Resign

Hackett said in a statement Jan. 7: “We are excited to welcome John to Alta Mesa Resources. With his broad financial expertise and proven leadership in public company financial functions, John should be a strong addition to our executive leadership team.”

As part of his appointment at Alta Mesa, effective Jan. 7, Regan will relocate from Dallas to Houston, where the pure-play Stack company is headquartered. His decades-long career also includes time with Flowserve Corp. (NYSE: FLS) as well as PricewaterhouseCoopers.