Peter Ludwig Berger (17 March 1929 – 27 June 2017) was an Austrian-born American sociologist and Protestant theologian. Berger became known for his work in the sociology of knowledge, the sociology of religion, study of modernization, and theoretical contributions to sociological theory. Berger spent most of his career teaching at The New School for Social Research, at Rutgers University, and at Boston University. Before retiring, Berger had been at Boston University since 1981 and was the director of the Institute for the Study of Economic Culture.