Carolyn Arthur "Biddy" Martin (born 1951) is an American intellectual, author, and since 2011 the 19th President of Amherst College, succeeding Anthony Marx.Before becoming president at Amherst, she was Chancellor of the University of Wisconsin–Madison, where she assumed office on September 1, 2008, succeeding John D. Wiley. She was the ninth graduate of UW–Madison to serve as its chancellor, and the first alumna to hold that position.