Kalz, M. (2019). Challenges of realising scalable open education with (peer) feedback. Invited keynote at the Open HPI Forum, 28. November 2019, HPI Potsdam, Germany.
Kalz, M. (2015). Who let the drop out? Invited keynote at the EADTU Conference on Online, open and flexible higher education, 29. October 2015, Fernuniversität Hagen, Germany.