Sensei Jeff Wynn is a Research Geophysicist with the US Geological Survey, Cascades Volcano Observatory, in Vancouver, WA, and a former Adjunct Full Professor at the University of Maryland. Wynn Sensei has many years of experience in martial arts including colored belt rankings in Tae-Kwon-Do, Wado-Kai Karate-Do, Goju-Ryu Karate-Do, and Goju-Kai Karate-Do. He holds Shichidan (7th degree) black belt in Budoshin Jujitsu, a Nidan (2nd degree) black belt in Russian Combat Sombo, and a Rokudan (6th degree) black belt in Taiho-Jutsu.