His most influential teacher was Pandit Pran Nath (1918–1996), a master of Indian classical voice who also taught La Monte Young, Marian Zazeela, and Michael Harrison. Riley made numerous trips to India over the course of their association to study and accompany him on tabla, tambura, and voice. In 1971 he joined the Mills College faculty to teach Indian classical music. Riley also cites John Cage and "the really great chamber music groups of John Coltrane and Miles Davis, Charles Mingus, Bill Evans, and Gil Evans" as influences on his work. He was awarded an Honorary Doctorate Degree in Music at Chapman University in 2007.