Hallucinogen is Simon Posford, a producer of goa/psychedelic trance music from England. His first album, Twisted is being considered as one of the most influential goa trance albums in the history of the genre. The follow-ups, "Deranger" EP and "The Lone Deranger" album only cemented his influence. Simon Posford is also known for his collaboration with Raja Ram, together they form the cult psychedelic chillout act Shpongle.