Belzebuub, born Mark, is an author from the United Kingdom known for his work on spirituality, self-discovery, astral travel, and dreams. In the early 2000s, he authored numerous books and courses centered on gaining spiritual knowledge through practical exercises. His teachings were influenced by the Gnostic teachings of Samael Aun Weor and Rabolu, which he encountered in the 1990s. He quickly became a prominent teacher within the Universal Christian Gnostic Movement in the UK, before founding The Gnostic Movement in 1999 in Australia.

Through The Gnostic Movement, Belzebuub introduced his own courses, which gained international popularity. In 2000, he launched the website Mysticweb, where he offered online courses on self-knowledge, out-of-body experiences and dreams, and esoteric wisdom, becoming the most popular of their kind at the time.

Belzebuub's last book was released in 2010, after which he stepped back from public life. Despite his success, he never profited from his work. His teachings have been disseminated globally, with courses offered in study centers across eighteen countries.