Marathon Oil Corporation says that Janet F. Clark, executive vice president and chief financial officer (CFO), has elected to retire on Oct. 1, 2013, after serving almost 10 years as the Company's CFO. The Marathon Oil board of directors has elected John R. ("J.R.") Sult to succeed Clark as executive vice president and CFO effective Sept. 3, 2013. Clark will serve as executive vice president, assisting in transition related matters during the month of September.

Sult, 54, was a member of El Paso Corporation's executive management team from 2005 until the company was acquired by Kinder Morgan Inc. in 2012. While with El Paso, he served as executive vice president and CFO from 2010 to 2012 and senior vice president and CFO from 2009 until 2010. Prior to that, he served as senior vice president and controller from 2005 until 2009. Sult currently serves on the board of directors of Dynegy Inc. and as chairman of the board of Boys and Girls Country of Houston Inc.

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