Seattle Seido Karate is an affiliated branch of the World Seido Karate Organization. It offers instruction following the standard Seido Juku curriculum taught by all affiliated dojos of The World Seido Karate Organization. The instructor, Jun Shihan Tom Tanaka, 6th dan, is a student of Tadashi Nakamura, the director of Seido Karate. Jun Shihan Tanaka has been teaching karate in Seattle since 1983 at the Downtown YMCA, Northshore YMCA, Phinney Neighborhood Center and the Washington Athletic Club.

Jun Shihan Tanaka is the designated Branch Chief of The World Seido Karate Organization for the Pacific Northwest Region, and directs operations and oversees instruction at all locations and affiliates in this area. All other Seattle Seido instructors and assistants have trained under Jun Shihan Tanaka, as well as training under Kaicho Nakamura's supervision at Seido Honbu in New York, and all instructors have received their black belt rankings from Kaicho Nakamura in New York.