In the late 70s Sensei Jim (Jim Rosenthal) started his combat career in the sweet science of boxing. His amateur career was 7 Wins and 1 Loss , 6 by K.O.

Sensei Jim trained in various martial arts from 1978 – 1995, but truly found his calling when introduced to the Yudansha Fighting System in June of 1995. Jim quickly moved up the belt grading system and started competing in 1997.

Jim was introduced to Renzo Gracie at a seminar that the Yudansha School promoted. Sensei Jim fell in love with the style of Gracie Brazilian Jiu Jitsu. He traveled to NYC several times over the next few years and received a blue belt in 1999 and a purple belt in 2003 under Renzo Gracie.

In 1996 Sensei Jim started training Muay Thai till 2001 under Oscar Kallet. He was the Light Heavy Weight Champion in kickboxing at that time.

In 1999 Jim opened Tenbears Martial Arts Academy, and started training harder to get his black belt in the Yudansha Fighting System. In 1999 Sensei Jim’s head instructor (Brian Johnson) in the Yudansha Fighting System moved out of state and Jim began working with Sensei Mark Connelly. In 2010 Jim began working with Marcello C. Monteiro and received his BJJ Black Belt in 2014.

Sensei Jim has been teaching various adult and children's classes and has also been training local law enforcement over the past several years. He continues to teach BJJ, Muay Thai, and the Yudansha Fighting System to his students at Tenbears Martial Arts Academy.

2001 - Silver Medalist Pan American (IBJF)

2000 - Gold Medalist Relson Gracie US National Champion

1999 - Gold Medalist Sport Jiu Jitsu National Champion

1999 - Gold Medalist Arnold World Gracie Champion

1998 - Gold Medalist Ohio State Jiu Jitsu Champion

1998 - Gold Medalist Badger Grappling In Port Clinton, OH.

1998 - Gold Medalist Sport Jiu Jitsu National Champion

1998 - Gold Medalist International World Championship,Vancouver Canada Sport Jiu Jitsu (ISJA)

1997 - Gold Medalist BCI Sport Jiu Jitsu Internationals

1997 - Gold Medalist Badger Grappling In Port Clinton

1997 - Silver Medalist Ohio State Sports Jiu Jitsu Champion

1997 - Silver Medalist National Sport Jiu Jitsu Grappling

1997 - Bronze Medalist National Sport Jiu Jitsu

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