Adolf von Harnack (1851-1930) is recognized as one of the outstanding church historians of his day. He was Professor of Church History successively in the universities of Leipzig, Giessen, Marburg, and Berlin. His great work, A History of Dogma, has exerted an important influence upon modern theological study. Other titles translated into English include A History of the Expansion of Christianity, The Apostles Creed, and The Acts of the Apostles.