He was a 7th Dan teacher of Taikiken, a Japanese off-shoot of Yiquan and had a significant history in Full contact Karate (Kyokushin-Kaikan).
Veteran Kyokushin practitioners from Japan considered Kallenbach as one of the most dominant foreign fighters during the style's early stages in 1960s and 1970s.
[3] Kallenbach worked as an assistant instructor at the Jon Bluming's "Budokai", and was also a member of the Karate Technical College of the N.K.A.
[4] In 1966, Kallenbach witnessed the strength of Kenji Kurosaki, who was instructing there and decided to move to train at the main Kyokushin Dojo.
The only person who could contain Kallenbach was Noboru Osawa, who was in charge of the Narimasu branch while Kenji Kurosaki was travelling to Europe.
Hatsuo Royama, who was recently banned from Kyokushin, due to an incident involving Kallenbach,[6] had started to study Taikiken under Kenichi Sawai.
During the Kyokushin Kaikan era, he held himself half-body, aimed at his face, took advantage of his height, and hit one-two and straight with speed.