Osaka Koryu

Kōryū Osaka (1901–1985), born Kōryū Matsumoto and later adopted into the Osaka family, was a Japanese lay Zen teacher in the Rinzai koan tradition and one of the three transmitters in the unusual triple-lineage of Taizan Maezumi Roshi, founder of the Zen Center of Los Angeles. From the 1930s onwards he directed the Hannya Dōjō (般若道場) in Tokyo — a lay zazen training hall founded by his own teacher Mushō Jōkō Roshi (1884–1949), a Shingon priest who had completed Rinzai koan study and who established the Shakyamuni-kai as a lay Rinzai community based at Hannya Dōjō with a mountain training centre, Hannya Fuji Dōjō, on Mt. Fuji. Jōkō Roshi instructed Kōryū never to take ordination, and Kōryū honoured that injunction throughout his life, becoming a leading figure in twentieth-century Japanese lay Rinzai practice^[1].

From the late 1960s Kōryū Roshi began travelling to Los Angeles for roughly three months each year at Maezumi's invitation, teaching the Rinzai koan system at the Zen Center of Los Angeles alongside Maezumi's own Sōtō and Sanbō Kyōdan training. The White Plum Asanga, the Maezumi-line lineage organisation, identifies him as one of three masters from whom Maezumi received final authorisation: Dharma transmission in the Sōtō line from his father Hakujun Kuroda Roshi (1955), Inka Shōmei in the Inzan-Rinzai line from Hakuun Yasutani Roshi (1970), and Inka Shōmei in the Takujū-Rinzai line from Kōryū Roshi (1973) — making Maezumi 'one of very few teachers to receive Inka in both the Inzan and Takuju Rinzai lineages, as well as Dharma Transmission in the Soto lineage'^[2].

Kōryū Roshi's distinctive emphasis was uncompromising lay practice: he held that householders could pursue the full Rinzai koan curriculum to its conclusion without monastic ordination, and his Hannya-Dōjō community modelled this for decades. His American students at ZCLA included Maezumi himself, Robert Aitken (later of the Honolulu Diamond Sangha), Philip Kapleau, and Peter Matthiessen at various stages, so his teaching reached the English-language Zen world well before Maezumi's inka was widely known. He left no institutional Western successor lineage in his own name; his enduring influence in the West runs through Maezumi Roshi and the White Plum Asanga, where his Rinzai koan training gave the Sōtō-rooted ZCLA curriculum a working koan system. Detailed English-language documentation of his published writings is sparse — most of his teaching circulated as oral instruction at Hannya Dōjō and as transcribed dharma talks distributed within the Shakyamuni-kai^[3].