Yamada Mumon Roshi (1900–1988) was a Rinzai Zen roshi, calligrapher, and former abbot of Shofuku-ji in Kobe, Japan. His commentary on Hakuin’s Song of Zazen was first published in Japan in 1962 and was recently translated into English for the first time.
Yamada Mumon Roshi chronicles the spiritual development of Zen Master Hakuin Ekaku, from his childhood fear of hell to his final awakening at the age of 42.