 In the early and mid 1950s Schaeffer's commitments to RTF included official missions which often required extended absences from the studios.This led him to invest Philippe Arthuys with responsibility for the GRMC in his absence, with Pierre Henry operating as Director of Works.Pierre Henry's composing talent developed greatly during this period at the GRMC and he worked with experimental filmmakers such as Max de Haas, Jean Grémillon, Enrico Fulchignoni, and Jean Rouch, and with choreographers including Dick Sanders and Maurice Béjart .