Zen Master Yunmen: His Life and Essential Sayings

Urs App, PhD, is a Swiss scholar of Buddhism and of the history of religions and ideas, specializing in Zen. He was, for many years, professor of Buddhism at Hanazono University in Kyoto and Associate Director of the International Research Institute for Zen Buddhism. He has since devoted himself to writing books and producing documentaries while engaging in research at various academic institutions in Asia and Europe.