David Bombyk, 36, president of Geffen Film Co., who was only 19 when he began his film career in Warner Bros.' story department. He became story editor for Kings Road Productions in Los Angeles, then joined Edward S. Feldman Productions as head of creative affairs in 1982. In 1984, he co-produced "Witness" and "Explorers" with Feldman. The next year, he produced the action thriller "The Hitchhiker." As an independent producer he developed motion picture properties for Walt Disney Productions and in 1986 joined Geffen, where he oversaw production of last year's hit film "Beetlejuice." In Los Angeles on Jan. 20 of the complications of AIDS.