Renshi Theodor Siegel began his martial arts training in 1974 in Lörrach studying Anti-Terrorkampf and Closed Combat , gaining his Shodan in 1981.
During the same time he began to learn Jiu-Jitsu, Hanbo-Jitsu and Tanto-Jitsu.

Renshi Theodor Siegel holds a 4th Dan in Jiu-Jitsu and a
1st Dan in Asian Close Combat. He is an instructor in Hanbo-Jitsu, Tanto-Jitsu and, Close Combat.

Renshi Theodor Siegel gained the title of Renshi in Jan.2005.

Renshi Siegel has travelled to many European countries and has met many greatly respected teachers and practisec under them. Robert Tobler 10th Dan Jiu-Jitsu, H.G. Niederstein 10th Dan Jiu-Jitsu, D. Lösgen 10th Dan Jiu-Jitsu.

Renshi Siegel met Soke Bryan Cheek for first time in 2003 at a seminar in Hannover. The next time 2004 in WEBBS Congress in Bale, and 2005 at an Instructor seminar for Jukoshin Ryu Jitsu.

Renshi Siegel has recently been appointed the Jukoshin Ryu representative for Germany.