Bryan Milton, president of ExxonMobil Fuels & Lubricants, announced his retirement effective Sept. 1. The company’s board of directors appointed Ian Carr to succeed Milton as president and also elected Carr as Exxon Mobil Corp. vice president.  Calumet Specialty Products Partners LP named Todd Borgmann as senior vice president and interim chief financial officer. Borgmann will assume the CFO duties on Sept. 1, following an orderly transition with the current executive vice president and CFO, H. Keith Jennings, who announced he will leave the organization effective Aug. 31.