 In 1947 he received his doctorate at the University of Strasbourg with the work "L'évolution des classes rurales en Bavière depuis la fin de l'époque carolingienne jusqu'au milieu du treizième siècle".Dollinger also taught German history and from 1952 worked on the summary report on published books during the history of Germany in the Middle Ages.He was leader of the city archives and the city library in Strasbourg from 1948 until 1974.