Sensei Jeff Wynn is a Research Geophysicist with the US Geological Survey, Cascades Volcano Observatory, in Vancouver, WA.
He holds Rokudan rank (6th degree black belt)
in Budoshin (Japanese-origin) Jujitsu, a 6th Degree in Taiho-Jutsu (the Japanese police
arresting art), and a 2nd degree black belt equivalent in Combat Sombo, the Russian
national martial art. Sensei Wynn is also the vice president of the American Jujitsu
In addition to his martial arts background, Dr. Wynn is also a research scientist; see https://unitedstatesgeologicalsurvey.academia.edu/JeffWynn