This screenwriter does not have many credits on his resume, but Stewart Stern makes up for quantity with quality. His work shows a particular gift for intimate character studies of alienated people whose quiet suffering suddenly erupts. The native New Yorker worked as a stage actor before serving in the infantry in WWII. Upon return to civilian life, Stern switched his concentration to writing. His first film credit was as dialogue director on Anthony Mann's fine, low-budget film noir "Railroaded" (1947). Soon thereafter, Stern began writing for CBS's "Playhouse 90" before earning his first