Greshake Gisbert (Reclinghausen 1933) graduated in philosophy and theology in Rome in 1957 and 1961 respectively, a doctorate in theology in Münster in 1969. From 1985 to 1997 he was Professor of Dogmatic and Ecumenical Theology at the University of Freiburg. He has published widely and is responsible, along with other specialists, the Fontes Christiani, edition of the ancient Christian texts.