Sufism is the mystical branch of the Islamic tradition. It was first brought to the United States in 1912 by a Sufi musician from India, Inayat Khan. American Sufis remained relatively few and isolated until the 1960s and 70s, when a new generation of Western seekers embraced these "eastern" esoteric teachings and practices. The subsequent waves of immigrants from traditional Muslim countries who arrived in the 1970s and 80s initiated the growth of...