In 1929 Riezler sided with Martin Heidegger during the famous "Davos encounter" with Ernst Cassirer and wrote an eyewitness account of this event, "Davoser Hochschulkurse 1929," for the Neue Zürcher Zeitung.
I 1929 holdt Riezler med Martin Heidegger under det berømte "Davosopgør" med Ernst Cassirer og skrev en øjenvidneberetning om begivenheden, "Davoser Hochschulkurse 1929," til Neue Zürcher Zeitung.