Anadarko Petroleum Corp. (NYSE: APC) said on Aug. 23 that Darrell Hollek has become executive vice president of operations; he was formerly the executive vice president for U.S. onshore E&P.

Also, Ernie Leyendecker was appointed as executive vice president of international and deepwater exploration; he was formerly senior vice president for international exploration.

As executive vice president of operations, Hollek will handle U.S. onshore E&P and midstream activities and also Gulf of Mexico and international operations.

Hollek has been at Anadarko since 1980, when he joined as a field engineer. He has worked in areas including global deepwater drilling; international, Gulf of Mexico and U.S. onshore E&P; and environmental, health, safety and regulatory.

Hollek will also remain as a director of Western Gas Holdings LLC, a subsidiary of Anadarko, and Western Gas Equity Holdings LLC, the general partner of Western Gas Equity Partners LP.

Leyendecker has more than 30 years of experience and joined the company in 2002. He has worked as general manager for worldwide exploration engineering, planning and international negotiations; as vice president of corporate planning; and as senior vice president of Gulf of Mexico exploration.

Bob Daniels, formerly executive vice president of international and deepwater exploration, will continue his current role as an executive vice president and member of the executive committee until his retirement later this year.

Jim Kleckner, formerly executive vice president of international and deepwater operations, also is retiring.