Omega Institute for Holistic Studies is a non-profit educational retreat center located in Rhinebeck, New York. Founded in 1977 by Elizabeth Lesser and Stephan Rechtschaffen, inspired by Sufi mystic, Pir Vilayat Inayat Khan and his ecumenical spirituality, today it offers classes to over 25,000 people a year, at the 190-acre (0.77 km2) campus.