Green Bay Jiu-Jitsu, located in Green Bay, Wisconsin, teaches MMA and Brazilian Jiu Jitsu, and is led by Greg Cornelius, who studied Dan Zan Ryu Jujitsu in 1990 at the Bushidokan Martial Arts Temple in Reno, Nevada under the instruction of Professor Herb LaGue, Rokudan (6th degree black belt). Greg earned his Shodan (1st degree black belt) in 1995 from the American Judo and Jujitsu Federation. Greg then continued his Dan Zan Ryu Jujutsu studies while teaching both juniors and adult classes at the Bushidokan. In 1998, Greg earned his Nidan (2nd degree black belt) in Dan Zan Ryu Jujitsu from the American Judo and Jujitsu Federation while under the instruction of Sensei Suki LaGue, (4th degree black belt).
In late 1998, Greg moved to Green Bay, Wisconsin and opened Green Bay Jiu-jitsu. It was at Green Bay Jiu-jitsu that Greg began his studies of Brazilian Jiu-jitsu and has since earned the rank of purple belt under the instruction of Jon Friedland and Henry Matamoros (Black Belts under Prof. Pedro Sauer).