de leeuw regularly conducts the netherlands' major orchestras and ensembles, including the royal concertgebouw orchestra, new sinfonietta amsterdam, residentie orchestra the hague and ensembles such as the netherlands chamber choir, the asko, the netherlands wind ensemble, and the orchestras of the dutch radio. in the 1995-96 season, he was the centre point of the 'carte blanche' series in the concertgebouw amsterdam. he is involved in the organization of the series 'contemporaries' at the concertgebouw amsterdam.