Where was the university at which Donald N. Langenberg  served on the Board of Trustees at the located? 
Donald N. Langenberg:  Langenberg has taught at the University of Oxford, the École Normale Supérieure, the California Institute of Technology, and the Technische Universität München and has served on the Board of Trustees at the University of the District of Columbia and the University of Pennsylvania. University of the District of Columbia: The University of the District of Columbia (UDC) is the only public university in the U.S. capital of Washington, D.C. UDC is one of the few urban land-grant universities in the country and a member school of the Thurgood Marshall College Fund.
Washington, D.C.