Guarda cosa ho trovato sul suo maestro:
"In 1975, the Israeli Karate team is invited to participate in the First World Knock Down Oyama Kyokushin championship. Dennis fought William Oliver, the American captain and champion, and was rated one of the seven best fighters in the world. The fight was won by Dennis, but was designated as a draw because of anti-Zionist politics. As a result of this fight, Dennis received his 3rd Dan from Kancho Mas Oyama and was established as President of the Israeli Kyokushin Federation and its main instructor in Israel and received his 4th Dan from the Israeli Karate, Federation. In 1977, he was appointed President of the Israeli Karate Federation and in 1979 his 5th Dan."