The Charles Barber Conductors on Film collection was begun in 1992 by Dr. Charles Barber, a conductor active in concert, opera, and recordings, and a teacher in the history and aesthetics of conducting. There are some 2000 hours of over 300 famous conductors variously in rehearsal, concert, and conversation. The earliest dates from 1897, and those with sound from 1926 (Henry Hadley). The collection of commercial releases and dubbed copies is predominately on NTSC or PAL VHS videocassette. Conductors prominently represented in the collection include Leonard Bernstein, Pierre Boulez, Karl Böhm, Sergiu Celibidache, Herbert von Karajan, Carlos Kleiber (with whom Barber studied), Otto Klemperer, Charles Mackerras, Charles Münch, Arthur Nikisch, and Leopold Stokowski. Barber also prepared catalogs of the collection; two printed editions (dated 2003 and 2005) and two 5.25" computer disks (with the catalog written in Apple's WriteNow software) are included.