sentences:  He has been a guest professor of theater at the Columbia University School of the Arts, Carnegie-Mellon University, Rutgers University and the Colorado College, as well as a Visiting Artist/Professor at the College of Santa Fe.He died of complications of pneumonia at the age of 80 on March 6, 2014, in Manhattan.Gottfried's writings include biographies of Sondheim, Arthur Miller, Jed Harris, Bob Fosse, Danny Kaye, George Burns, and Angela Lansbury.