Steven L. Mueller has been promoted to CEO of Southwestern Energy Co. Mueller joined Southwestern in June 2008 as president and COO. A graduate of the Colorado School of Mines, Mueller previously worked for Tenneco Oil Co., Fina Oil Co., American Exploration Co., Belco Oil & Gas Co., The Houston Exploration Co. and CDX Gas LLC. Harold M. Korell, who is stepping down as Southwestern’s CEO, was appointed to serve as executive chairman until his retirement in early 2010, after which he would become the nonexecutive chairman.

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