Sarah Colleen Hanlon Koch (born 1979)[1] is an American mathematician, the Arthur F. Thurnau Professor of Mathematics at the University of Michigan.
[2] Koch was born and educated in Concord, New Hampshire, with summers in Wilmington, Vermont.
She went to the Rensselaer Polytechnic Institute, initially studying chemistry but soon switching to mathematics;[3] she graduated in 2001.
Next, she went to Cornell University for graduate study in mathematics, earning a master's degree in 2005,[4] and completed her studies with a double Ph.D., supervised by John H. Hubbard: a doctorate from the University of Provence in 2007 with the dissertation La Théorie de Teichmüller et ses applications aux endomorphismes de
,[4][1] and a doctorate from Cornell in 2008 with the dissertation A New Link between Teichmüller Theory and Complex Dynamics.