Professor Dorn taught courses at Cornell University and the University of Toronto. He has also gave guest lectures at these universities:

Canada: Carleton University;  Dominican University College; Humber College;  McMaster University; Mount Saint Vincent University; Queen's University;  Quest University; Université d'Ottawa (en français); Université de Montréal (en français); University of Ontario Institute of Technology; University of British Columbia (UBC); University of Western Ontario (UWO); and Wilfrid Laurier University.

USA: Cornell University; City University of New York (Graduate Centre); Long Island University; Massachusetts Institute of Technology; National Defence University; State University of New York (SUNY) at Cortland; and University of California at San Diego.

Abroad: Cambridge University (UK); Hochschule für Politik München (Germany); Munich University (LMU, Germany); Soka University (Japan); Udayana University (Indonesia); Universidad Nacional Autónoma de México (UNAM, Mexico); and University of Konstanz (Germany).



In addition to the Royal Military College and the Canadian Forces College, he has lectured in courses at the following military institutions: Centro de Estudios Superiores Navales (CESNAV) (Mexico City); Joint Forces Staff College (Norfolk, Virginia); Canadian Land Forces Command and Staff College (Kingston, Ontario); Canadian Forces School of Military Intelligence (Kingston, Ontario); and the Virginia Military Institute (Lexingon, Virginia).