Biography of Raymond “Duke” Moore – founder of Zen Budokai Aikijujitsu. (Link to Stanford Zen Budokai website)
Biography of Soke Tim Delgman – current headmaster of Zen Budo-Ryu.
20th Century Jujutsu is a good article explaining the history of Jujutsu as a whole. The origins of Zen Budokai are explained in the last section.