Samuel L. Lewis was an American mystic and horticultural scientist who founded what became the Sufi Ruhaniat International, a branch of the Chishtia Sufi lineage. After a lifetime of spiritual study with teachers East and West, primarily Hazrat Inayat Khan and Nyogen Senzaki, Lewis was recognised simultaneously as a Zen master and Sufi Murshid (senior teacher) by Eastern representatives of the two traditions. He also co-founded the Christian mystical order called the Holy Order of Mans. His early interest in the international seed exchange and organic agriculture also established him as one of the pioneers of green spirituality. His most enduring legacy may be the creation of the Dances of Universal Peace, an early inter-spiritual practice that has spread around the world in the 43 years since his passing.