Antony Cummins is the founder of the Historical Ninjutsu Research Team, which has previously published The Book of Ninja (Watkins). Antony also works as a consultant and co-presenter of Urban Canyon Films to produce high-end documentaries on Japan that are distributed by National Geographic. He has been recognized by peers as a leading expert in the discovery of military arts of medieval Japan.

Yoshie Minami was born in Tokyo and currently lives in Saitama, Japan. She has a BA degree in Linguistics from the International Christian University. As a translator, she has published True Path of the Ninja, Secret Traditions of the Shinobi, Iga and Koka Ninja Skills, Samurai War Stories and has worked with Antony on various projects including the Japanese book True English.