Tenure: 9 months
Ed Whitacre, Jr., took the reins of GM after Henderson's resignation. Whitacre was a Renaissance man who had been the chief executive officer of AT&T and the national president of the Boy Scouts of America. He also sat on Exxon Mobil's board of directors. What he became most famous for, however, was his fondness for discontinuing GM brands, a tendency that earned him the nickname "The GM Reaper."
Whitacre was all set to preside over the company's initial public offering, and was personally excited to be on board when GM left its status behind as a government property. Investors were anxious for the company to have a long-term CEO in place before the IPO, however, and Whitacre simply wasn't interested. He resigned on Sept. 1, 2010, nine months to the day of his appointment. That he was a transitory figure at the company shouldn't have been much of a surprise as that same year he had famously been quoted by Bloomberg News as saying, "I don't know anything about cars."