General Motors has announced that Chris Liddell, the company’s vice chairman and chief financial officer, is leaving the automaker. Liddell joined GM in January 2010 and was instrumental in guiding the manufacturer through its recent initial public offering. At this point, the reasons for Liddell’s departure remain unclear.

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According to Automotive News, Liddell was initially viewed as one possible successor to Ed Whitacre as CEO of GM, though that changed when Whitacre unexpectedly announced his plans to retire.

Since then, Dan Akerson has been picked to lead GM.

Dan Ammann (above right), who currently serves as the automaker’s treasurer, will succeed Liddell. Ammann has been with GM for less than a year, having joined the company in March of 2010. Before joining the automotive industry, he served as the managing director and head of industrials investment banking at Morgan Stanley for four years.

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