From the dragonball series, he is a martial arts master and teacher, having only two pupils (The Ox-king, and Grandfather Gohan) before Goku and Krillin. His master is Mutaito, a martial arts master that once saved the world from King Piccolo by sealing him in an electric jar using the Evil Containment Wave (Mafuba in Japanese). He is also referred to as The Turtle Hermit.
That's Master Roshi, the king of martial arts.
by kyle.biddle January 10, 2011