Marathon Oil Corp. (MRO) said Sept. 23 that the former CEO of Aera Energy LLC, Gaurdie E. Banister Jr., has been elected to its board of directors.

Banister's election is effective Oct. 1. Banister, 57, recently retired after serving eight years as president and CEO of Aera Energy, an oil and gas E&P company jointly owned by Shell Oil Co. and ExxonMobil (XOM), headquartered in California.

Banister has 35 years of oil and gas experience, and prior to Aera served in executive level positions at Shell, including technical vice president Upstream Asia Pacific and technical vice president Upstream Americas.

"We welcome Gaurdie Banister to Marathon Oil's board of directors," said Dennis H. Reilley, Marathon Oil's non-executive chairman of the board, in a statement.

"Gaurdie brings deep E&P experience, including most recently in the U.S. onshore, a track record of operational excellence and astute business insights. His principled leadership, integrity and attention to safety align perfectly with Marathon Oil's core values. We look forward to his contributions," Reilley added.