Sensei koller has been practicing karate intensely since 1970. Dedicated to the martial arts he has lived in Japan from 1975-1977 with his family and studied karate and Kendo. he was taught by Shogi Sensei and Sato Sensei and returns every year to Japan to perfect his technique.

For seven years he held the title of Champion of Switzerland and has competed all over the world in karate and kendo. For such a big man his incredible speed surprises everyone who has seen him in action or has been unfortunate enough to have come up against him in kumite. Koller Sensei holds a 6th Dan in Karate and a 3rd Dan in Kendo. He is President of the IJKA European Technical Committee.