The Mountains and Rivers Order of Zen Buddhism (MRO) is an organization of associated temples, practice centers and sitting groups in the United States and abroad. The main house is the Zen Mountain Monastery located at the foot of Mount Tremper in the Catskill Mountains of New York, and also includes the Zen Center of New York City in downtown Brooklyn, and affiliate groups. The MRO was founded by Zen Master John Daido Loori, Roshi, in 1980. It is inspired by the teachings of Zen Master Dōgen as presented in his Mountains and Rivers Sutra (Sansui kyō). The current head of the order is Geoffrey Shugen Arnold, Roshi.