RAGNAR JIU JITSU offers classes in Brazilian Jiu Jitsu for adults, teens and kids. We are located at Freestyle Muay Thai in Tampa, FL. Taught by head instructor Professor James "Ragnar" Doner. Professor James was promoted to black belt by 3rd degree black belt Professor Mike Geery under Professor Cassio Cardosi (5th degree black belt under the legendary Master Fabio Gurgel).