At the Munich Film Museum Drössler works on the reconstruction of lost or fragmentary silent films like works by Ernst Lubitsch, Manfred Noa, Richard Oswald, Walther Ruttmann, Robert Reinert and of censored, re-edited or never completed sound films by Orson Welles, Max Ophüls, Werner Schroeter, Katrin Seybold. He is editor of the DVD label Edition Filmmuseum and recognized as a leading expert on the international history of 3-D film.