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.
Carl Gustav Adolf von Harnack (7 May 1851 – 10 June 1930) was a German Lutheran theologian and prominent church historian. He produced many religious publications from 1873 to 1912 (in which he is sometimes credited as Adolf Harnack).
Harnack traced the influence of Hellenistic philosophy on early Christian writing and called on Christians to question the authenticity of doctrines that arose in the early Christian church. He rejected the historicity of the Gospel of John in favor of the Synoptic Gospels, criticized the Apostles' Creed, and promoted the Social Gospel.