Grzegorz Zabinski is a medievalist from Upper Silesia in Poland. Apart from medieval and early Renaissance military history and martial arts, his fields of interest include problems of medieval social and economic history, with special reference to the Cistercian order. He is currently working on a Ph.D. dissertation on early 16th-century comments on the swordsmanship treatise of Johannes Liechtenauer.
Bartlomiej Walczak is a student of nuclear physics, but his real passion is the study of medieval martial arts, which he has been pursuing since 1997. He is the chief of the Brotherhood of the Eagles' Nests, a member of the Historical European Martial Arts Community and the director of Association for Renaissance Martial Arts in Poland. Currently, he is working on a training curriculum based on Johannes Liechtenauer's teachings.