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Andreas Müller is born in Bochum in Germany. He studied protestant theology in Bethel/Bielefeld, Bern (CH) and Heidelberg. After his examinations he spent two years in Thessalonica for postgraduate studies. In this time he began to write his doctoral thesis on the first contacts between the Reformation and the Orthodox Churches focusing on an text presenting the protestant tradition to Greek Orthodox people in 1550. Müller spent some time again in Bielefeld to finish his doctoral thesis and to work as a vicar in his church. From 1998 to 2003 he worked as assistant at Munich in Church History. He wrote his habilitation thesis on Spiritual Obedience in the ladder of St. John Climacus. From 2003 to 2009 he worked as a pastor in Minden, where he wrote a book about the church of this area in the time of Nazism. He also worked as temporary professor in Jena, Kiel and Berlin. 2009 Müller became professor for church history and religious history of the first millenium. He is senator in the university council and president of the section of Church History of the Scientific Society of Theology in Germany.