American Energy Partners LP, formed earlier this year by Aubrey K. McClendon, has hired Jeff Fisher, 53, as COO. Fisher was executive vice president of production for Chesapeake Energy Corp. until he was fired in August (see Daily GPI, Aug. 14). A 10-year Chesapeake employee, Fisher was appointed operations manager in 2003 and served as vice president, Operations for the Southern Division from 2005-2006. In 2012, Fisher was appointed senior vice president of production and was then promoted to oversee all operations. Fisher oversaw an operations team with more than 2,000 employees, 23,000 operated wells and 40,000 total properties. He also supervised more than 12,000 well completions. American Energy Partners is headquartered in Oklahoma City.