Gregory A. Petsko is Chair of the Department of Biochemistry at Brandeis University in Waltham, Massachusetts, where from 1994 to 2008 he served as Director of the Rosenstiel Basic Medical Sciences Research Center. Since 1996 he has held the title of Gyula and Katica Tauber Professor of Biochemistry and Chemistry, succeeding Professor William P. Jencks, the first holder of this chair.