Kapleau later covered the International Military Tribunal for the Far East, commonly known as the Tokyo War Crimes Trials. While in Japan he became intrigued by Zen Buddhism. During the tribunal he became acquainted with Karlfried Graf Dürckheim, then a prisoner at Sugamo Prison, who recommended that Kapleau attend informal lectures given by D.T. Suzuki in Kita-Kamakura. After returning to America, Kapleau renewed his acquaintance with D.T. Suzuki who had left Kita-Kamakura to lecture on Zen at Columbia University. But disaffected with a primarily intellectual treatment of Zen, he moved to Japan in 1953 to seek Zen's deeper truth.