Tris is Indonesian. His father, a Doctor, was drafted into the Japanese navy and attended military college in Japan in the 30's (when they controlled Indonesia). That's where he trained with Funakoshi, and one of Usheiba's students in Aikido.
He only teaches privately today, Shotokan and Indonesian arts, in separte classes in NE Penna. He is doing clinics on the Indonesian systems.
If you do a Google for Tristan Sutrisno I know you'll find his site on his Indonesian arts. There are several clips there and I can only say he's far faster in person than they show.