Koei-Kan is an original style of Karate that can be traced back to its roots in China, Okinawa, and Japan. Master Eizo Onishi founded the Koei-Kan system of Karate in 1952. Master Onishi was a senior student of two prominent Okinawan Karate instructors, Master Kanken Toyama (1888-1966), and Master Juhatsu Kiyoda (1888-1967). He also studied Chinese fistic arts with various teachers, particularly, Master Koichi Kyo (Japanese pronunciation), a university professor from Taiwan. Master Onishi also studied traditional Japanese Martial Arts, such as Judo, Kendo and Jodo.

Master Eizo Onishi established his first official "dojo" on April 2nd, 1954 in Kanagawa-Ken, Japan. Edward Kaloudis brought Koei-Kan to the United States in 1954 with the permission of its founder, Kancho Eizo Onishi. Kaloudis Sensei is without a doubt the major pioneer of Koei-Kan in the United States, Europe, and Latin America. Brian Frost is the holder of a 7th Dan, and serves as the Chief Technical Director for Koei-Kan and National Director for Koei-Kan in the United States.