D. Feldner is a graduate lawyer who holds an executive master's degree in business law. She has studied in Berlin, Leuven, Budapest and Athens. Feldner is a graduate of the Helmholtz Academy and a certified manager in St. Gallen. She has worked in the German Federal Ministry for the Environment, in an international corporate law firm, as a cooperation manager and as a corporate lawyer. Feldner was also the personal advisor to the rector of Heidelberg University and chief of staff to the rector.