Masahiko Kimura (September 10, 1917 — April 18, 1993) is considered by many to be one of the greatest judoka of all time.

Kimura's many exploits include defeating Helio Gracie in a martial arts match.  It was during this match that he broke Helio Gracie's arm using an arm bar technique now commonly refered to as the Kimura.

 Here is a video of the famous Kimura vs Helio Gracie match in 1951.

 Below is Kimura giving a demonstration of various Judo techniques.