HEMA researcher and instructor specializing in the traditional martial arts of medieval and renaissance Europe. He has studied the history of swordsmanship since 1982, with a primary emphasis on the German martial tradition.

In recent years, he has broadened his inquiries to include the Iberian, French and Belgian martial traditions as well. He has taught and lectured in 16 countries, focusing on the German and Iberian longsword traditions.

He also has a background in sport fencing (foil, epee, sabre) and the Japanese sword arts (kendo, iaido).