From: Biography and Profile of Jackie Chan
http://martialarts.about.com/od/martialartsculture/p/jackiechan.htm

The Martial Arts Background of Jackie Chan:
Much of Chan's martial arts skills came from practicing the arts while at the Chinese Opera Research Institute, headed by Master Yu Jim Yuen. However, he did eventually train specifically in Hapkido, earning his blackbelt under Grandmaster Jin Pal Kim. All told, Chan has trained in Shaolin Kung-fu, Tae Kwon Do, and Hapkido.
"He took his Hapkido seriously, practicing for hours at a time," said Kim according to article at Web-vue.com. In fact, Kim noted that Chan was one of the hardest working people he'd ever been around.