Antony Cummins heads the Historical Ninjutsu Research Team, a project that documents, translates and publishes medieval documents pertaining to the Shinobi of Japan. As a world-renowned ninja historian, his background as a historian gives him a unique insight into their mysterious world. Cummins has revived an old samurai school of war, Natori-Ryu, with the aim of educating people on historical Japanese warfare. His aim is to establish a correct understanding of Japanese military arts and to bring about a deeper knowledge of, and respect for, Japanese arts. A trained martial artist, he is the author of nearly a dozen books on ninja and martial arts, including Tuttle's True Path of the Ninja and Samurai and Ninja. He has been featured in a number of Smithsonian Channel videos, including Ninja: Shadow Warriors, Samurai Head Hunters and Samurai Warrior Queens.

Jayson Kane was born in South Africa and studied art, design and printmaking in Manchester, UK. He has worked on several of Antony Cummins' books including internal illustrations for Iga and Koka Ninja Skills, The Illustrated Guide to Viking Martial Arts and Ninja Skills; front cover design for The Secret Traditions of The Shinobi and The Lost Warfare of India: An Illustrated Guide; and cover concept design for True Path of The Ninja.