Grethlein, Christian Oskar was born on August 30, 1954 in Nuremburg, Germany. Son of Gerhard Ludwig and Irene Irmgard Grethlein.
Doctor in Theology, University Munich, 1983. Habilitation, Erlangen University, Germany, 1986.
Pastor Evangelical Lutheran Church Bavaria, Regensburg, 1980—1984. Assistant professor theology University Erlangen, 1984—1988. Professor theology Church College, Berlin, 1988—1992, Halle (Germany) University, 1992—1997, Munster (Germany) University, since 1997.
Prodekan University Halle, 1996—1997. Chairman Lutheran Liturgical Conference Germany, since 2001.