Gabe Klein is an entrepreneur, author, investor and former government official. Klein was Commissioner of the Chicago Department of Transportation (CDOT) from May 16, 2011 to December, 2013. He was appointed to this position by Mayor Rahm Emanuel when he took office on May 16, 2011. Klein was also the Director of the District of Columbia Department of Transportation (DDOT) from the end of 2008 until the end of Mayor Adrian Fenty's term, December 31, 2010. Prior, Klein was an Executive with Boston-based Zipcar. He recently authored a book titled Start-Up City: Inspiring Private and Public Entrepreneurship, Getting Projects Done, and Having Fun published by Island Press.