Alan Butler is an author recognized for his numerous books that delve into pseudohistorical and conspiracy theories. His work often examines subjects such as the geometry of ancient structures and the historical origins of Freemasonry. Butler frequently collaborates with other authors, notably Robert Lomas and Alan Butler, to explore these complex themes.

His writings have touched upon a wide range of subjects, including the mysteries surrounding the Holy Grail, the nature of ancient civilizations, and unconventional interpretations of historical artifacts and astronomical phenomena. One of his books, "Who Built the Moon?", co-authored with Alan Butler, gained notable recognition as the inspiration for the 2022 science fiction film "Moonfall". Butler's contributions lie in presenting alternative perspectives on historical narratives and ancient knowledge, often within a framework of esoteric or hidden histories.

Alan Butler's literary output is largely dedicated to exploring subjects that fall outside mainstream historical and scientific consensus. He has extensively written about theories concerning the purported hidden knowledge embedded in ancient geometries, such as the concept of '366-degree geometry.' A significant portion of his work also focuses on the origins and esoteric traditions of Freemasonry, presenting alternative narratives to conventional historical accounts. These explorations often aim to uncover supposed lost histories or secret traditions that have shaped human civilization.

Butler has engaged in prolific collaborations throughout his writing career, most notably with Robert Lomas and Alan Butler. These partnerships have resulted in a series of books that investigate various esoteric and pseudohistorical themes. Topics covered include the quest for the Holy Grail, the potential for ancient machines to have influenced historical events (as in 'Uriel's Machine'), and speculative ideas about the construction of monumental structures like the pyramids. The book 'Who Built the Moon?', co-authored with Alan Butler, stands out for its influence on popular culture, serving as the basis for a major motion picture.