Geoffrey Shugen Arnold, Roshi is the Head of the Mountains and Rivers Order, abbot and resident teacher of Zen Mountain Monastery. Shugen entered full-time residential training in 1986 after studying mathematics and receiving a degree in classical music. He received dharma transmission from John Daido Loori, Roshi in 1997. His teachings on Zen, social justice and environmental stewardship have appeared in various Buddhist journals. His book of poetry, O, Beautiful End, a collection of Zen memorial poems, was published in 2012.