Marathon Oil appoints John Sult to succeed Janet Clark as CFO Marathon Oil announced that Janet Clark, executive vice president and CFO has elected to retire on Oct. 1 after serving almost 10 years as the company's CFO. The Marathon Oil board of directors has elected John Sult to succeed Clark as executive vice president and CFO effective Sept. 3. Clark will serve as executive vice president, assisting in transition related matters during the month of September. Sult was a member of El Paso's executive management team from 2005 until the company was acquired by Kinder Morgan in 2012.
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