Parsons was introduced to Thelema through his association with Wilfred Smith, a member of the Agape Lodge of Ordo Templi Orientis (OTO). He was immediately drawn to Crowley's teachings and saw them as a framework for achieving personal and societal transformation.

Parsons quickly rose through the ranks of the Agape Lodge, becoming a prominent and influential member. He embraced Thelemic rituals and principles, incorporating them into his daily life and worldview.

Parsons marries Helen Northrup, sister of Jane Wolfe, a prominent Thelemite, further cementing his ties to the occult community. Helen, under the magical name 'Lilith,' became an active participant in Parsons' occult rituals.

Parsons became acting head of the Agape Lodge in Pasadena. This period was marked by intense occult activity, including rituals aimed at invoking elemental forces and achieving personal enlightenment.

Parsons, along with L. Ron Hubbard, conducted the 'Babalon Working,' a series of magical rituals intended to invoke the goddess Babalon and usher in a new aeon. The rituals were controversial and had a profound impact on Parsons' life and worldview.

Following the Babalon Working and his experiences with Hubbard, Parsons experienced increasing disillusionment with the OTO and Thelema. He struggled to reconcile the magical principles with the realities of his life.

Parsons wrote to Aleister Crowley, seeking guidance on matters related to magic and his inner self. Crowley responded, warning Parsons about his impulsiveness and lack of self-control, advising him to focus on discipline and restraint.

Despite his disillusionment, Parsons continued to grapple with Thelemic ideas and principles until his death. He sought to integrate his scientific and occult pursuits, seeking a unified understanding of the universe.