Sensei Jim Riddle began studying martial arts in college when he joined the University of Denver Judo Club in 1995.  Upon returning home to Dallas in 1999 with a BFA degree in Graphic Communication Design, he continued practicing Judo at the Tamura Judo Institute where he also began learning Heike Ryu Jiu-Jitsu.  It was at the Judo school that Jim Riddle met Dr. Chamberlain at Jiu-Jitsu practice.  In the summer of 2001 he began practicing Kenpo under Dr. Chamberlain.  Under the instruction of Sensei Tamura, Sensei Jim Webb and Sensei Adam Martin, he was promoted to Nidan in Heike Ryu in February of 2003.  He was promoted to a Shodan in Kenpo in August of 2003, and to Nidan in October of 2004.