Steve Duffy started his karate training in the early 1970's under former KUGB British International Team member Sensei Jim Wilson. He was also a student of Sensei Enoeda and Sensei Tomita at the Shotokan Karate Centre in London and attained 2nd Dan Black Belt in the Shotokan style. In 1981 he won the South of England Kata Championships and gained third place in kumite at Sensei Enoeda's Dojo Championships. In this period, he was also a member of the Toyakwai 'A' Kumite Team.
In the 1980's he started training in Gojuryu Karate and was a founder member of Shuji Tasaki's Great Britain Goju-Ryu Karate-Do Seiwakai group . In 1989 he was a member of the first British team to enter the Japan Karate Federation Gojukai Championships in Takamatsu, Japan. It was at this time that he first trained with Katsutoshi Ishihara, Grandmaster of the Shoseikan.
On the passing of Sensei Tasaki in 2011, Steve affiliated his school to Kancho Ishihara's World Shoseikan Karatedo, with headquarters in Chiba, Japan.
Steve has trained under many other teachers over his career including Goju masters Goshi Yamaguchi, Takeshi Uchiage and Tadamitsu Matsuo (Ritsumeikan University). Others include Professor Wally Jay, Richard Kim, Don Warrener and Don Jacobs.
Steve has been a professional karate instructor since 1984 teaching thousands of students in North London.