Sensei Karri Naukkarinen started his martial art career in 1992 when he began to train Hokutoryu Jiu-Jitsu. He had trained various styles of Jiu-Jitsu, both traditional and modern, as well as Muay Thai and several Okinawan styles of fighting arts.

Since moving to his contemporary hometown Oulu he started to train under Finnish WEBBS representative Sensei Timo Mallinen, with whom he travelled in Finland and abroad to learn from many masters.

Sensei Naukarinen met Soke Bryan Cheek for first time at Aibudo Ju Jitsu Club's seminar in Oulu in the beginning of 2004. Since then sensei Naukkarinen has been devoted himself to learn the art of Jukoshin Ryu. Since 2005 Sensei Naukkarinen has been a chief instructor in Aibudo Ju Jitsu Club. He has also teaching experience of security and self defence courses for different types of groups, such as guards, health care staff etc.