Hackleman was born in New York City but moved to Honolulu, Hawaii at the age of four. He began studying Judo when he was about nine years old. By the time he entered high school, Hackleman was a Golden Gloves boxer and a competitive kickboxer. He had some Shotokan Karate training, but by the age of 10 studied Judo and KaJuKenBo under Walter Godin, with whom he would continue to train until Godin’s death in 2002. Kajukenbo is a mixture of Kempo Karate, Tang Soo Do, Judo, Jujitsu, Chinese Kenpo, and Chinese boxing (Kung Fu), which was developed …