Gregory E. Fischer (born January 14, 1958) is a businessman and Mayor of Louisville, Kentucky. He is a graduate of Louisville's Trinity High School and Vanderbilt University, entrepreneur, and community leader.Fischer ran in the Kentucky Democratic primary for the United States Senate in 2008, where he finished second and received over 209,000 votes (34 percent) among seven candidates.In November 2010 he was elected Mayor of Louisville in a tight race against city councilman Hal Heiner.