Clemens Krauss
Conductors with whom he collaborated were Hans Knappertsbusch, Clemens Krauss, Joseph Keilberth, André Cluytens, Pierre Boulez, Herbert von Karajan, Erich Leinsdorf, Heinz Tietjen, Lorin Maazel, Wolfgang Sawallisch, Karl Böhm, Bruno Maderna, and Thomas Schippers.