Ordo Templi Orientis

The Ordo Templi Orientis (OTO) is an occult fraternal organization founded around 1904 by Austrian Carl Kellner and German Theodor Reuss. The organization was originally designed as a synthesis of various esoteric traditions, including Freemasonry, Rosicrucianism, and Eastern mysticism, with a particular emphasis on sexual mysticism and tantric practices as paths to spiritual enlightenment.

The organization's most significant transformation occurred when British occultist Aleister Crowley became its head in 1922, following his development of the philosophical and religious system known as Thelema. Under Crowley's leadership, the OTO adopted Thelemic principles as its central doctrine, with the core teaching "Do what thou wilt shall be the whole of the Law" becoming the organization's guiding philosophy.

The OTO operates through a system of degrees or grades, similar to Freemasonry, with members progressing through increasingly advanced levels of instruction in Thelemic philosophy, ritual practice, and ceremonial magic. The organization includes both local lodges for regular members and higher-level bodies for advanced practitioners and administrators.

Throughout its history, the OTO has faced various legal challenges and internal schisms, particularly following Crowley's death in 1947, when different factions claimed authority over the organization. The most widely recognized lineage today traces through Grady McMurtry, who established the organization's current legal structure and international presence in the United States during the 1960s.

While the OTO has been subject to various conspiracy theories due to its secretive nature and association with Crowley's controversial reputation, it operates as a legal religious organization in multiple countries. The group publishes its basic principles openly and maintains educational and charitable activities alongside its ritual and philosophical work, distinguishing it from fictional secret societies in popular culture.