Bruce Lee, who was born 65 years ago this past Sunday, believed in evolution (lowercase “e”). While posters of his bare upper body have adorned three generations of college dorm room walls and his legacy is obvious in Hollywood action movies, few Americans are aware that Lee founded the art of Jun Fan Gung Fu, which later became Jeet Kun Do, or JKD. Lee designed JKD to be a philosophy of fighting (rather than a style) based on the belief of blending styles and changing techniques as needed.