Hallucinogen is Simon Posford, a producer of psychedelic trance music from England. His first album, Twisted, was one of the most widely influential psy-trance recordings. 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. He has many other side projects such as Younger Brother (with Benji Vaughan), Celtic Cross (with Martin Glover, aka Youth), some tracks with The Infinity Project, Beast, and many others. While he has only released two Hallucinogen albums, he has remained very active in many projects.
His album "Twisted" is the best selling psy trance-album ever.