Mills has nearly 35 years of experience in the oil and gas industry, including most recently as board chairman and CEO of Eagle Rock Energy Partners.
Brent Eshleman has more than 30 years’ experience in the oil and gas industry and is an engineer.
The Houston-based company commented that Bird's departure was not related to any disagreement with Frank's or any matters relating to its operations, policies or practices.
EnerJex also named Louis G. Schott as interim CEO following the resignation of Robert G. Watson Jr., who is leaving the company to pursue other business opportunities.
The planned succession will be effective after Oceaneering's annual shareholder meeting on May 5, the company said.
In addition, Craig W. Collins has been named senior vice president of operations and COO of Western Gas.
Before joining Questar, Micheal G. Dunn was president and CEO of PacifiCorp Energy, a multi-state regulated electric power generating company and subsidiary of Berkshire Hathaway Energy.
Nigeria's anti-corruption organization seized $9.8 million in cash from the former head of the state oil company, a spokesman said on Feb. 10, as the government continues to battle endemic corruption.
Grant Sims has been director and CEO of the general partner of midstream MLP Genesis Energy Partners LP since August 2006, and chairman of general partner’s board since October 2012.
"I think you're bringing on someone like Simon Henry who's got a wealth of experience across the [oil and gas] space," Jamie Campbell, head of natural resources at Panmure Gordon, said. "But I just can't see Rio going from zero to 100 in the energy sector in this environment."
Claire S. Farley is currently the vice chair of energy, advising KKR & Co. LP's energy group, and she is a director of LyondellBasell Industries NV and TechnipFMC Plc.
R. Scott Rowe has been appointed president and CEO of Flowserve Corp. (NYSE: FLS), a provider of flow control products and services, effective April 1. He succeeds Mark Blinn, who previously announced his intention to retire.