Discover Financial Services of Riverwoods, Ill., on Monday announced the appointment of R. Mark Graf as its executive vice president, chief financial officer and chief accounting officer, succeeding Roy Guthrie, who is retiring.

Graf was previously an investment adviser with the private-equity firm Aquiline Capital Partners, and before that he was a partner with Barrett Ellman Stoddard Capital. Graf also was executive vice president and chief financial officer of Fifth Third Bancorp.

Graf, who will report to David Nelms, Discover's chairman and chief executive, begins his new role April 11,

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