Southwestern Energy Company Promotes Steven L. Mueller to Chief Executive Officer

Southwestern Energy Company Promotes Steven L. Mueller to Chief Executive
Officer

HOUSTON, May 19 /PRNewswire-FirstCall/ -- Southwestern Energy Company (NYSE:
SWN) today announced that Steven L. Mueller was promoted to Chief Executive
Officer on May 19, 2009. With over 30 years of experience in the oil and gas
industry, Mr. Mueller joined Southwestern in June 2008 as President and Chief
Operating Officer. A graduate of the Colorado School of Mines, Mr. Mueller
has served in multiple operational and managerial roles at Tenneco Oil
Company, Fina Oil Company, American Exploration Company, Belco Oil & Gas
Company, The Houston Exploration Company and CDX Gas, LLC.

Harold M. Korell, the company's previous Chief Executive Officer, was also
appointed to serve as Executive Chairman of the Board of Directors until his
retirement no earlier than the end of the first quarter of 2010, after which
he will become the non-executive Chairman of the Board. At the 2010 Annual
Meeting of Shareholders, Mr. Korell will seek re-election to the Board.

"Steve's leadership, technical abilities and focus on value creation are
valuable assets to our company at a time when we are poised for significant
growth over the next several years," stated Harold M. Korell. "With Steve and
our strong management team in place, we will remain focused on having the
Right People doing the Right Things and creating value with every dollar we
invest."

Southwestern Energy Company is an independent energy company whose
wholly-owned subsidiaries are engaged in oil and gas exploration and
production, natural gas gathering and marketing. Additional information on the
company can be found on the Internet at http://www.swn.com.

SOURCE Southwestern Energy Company

Greg D. Kerley, Executive Vice President and Chief Financial Officer,
+1-281-618-4803, or Brad D. Sylvester, CFA, Vice President, Investor
Relations, +1-281-618-4897, both of Southwestern Energy Company