The late Fraser Clark was the founder and editor of Encyclopedia Psychedelica and a key advocate of the rave movement, hosting regular small underground parties which laid the way for the launch of the first large legal festi-rave club in central London, Megatripolis in 1993.
He advocated a new form of hippy - the "Zippie" - who would follow Timothy Leary in his modern philosophy of "Drop out, and drop in again". In other words, embrace peace and love but also embrace technology and aspire towards the lifestyle that affords it. This was later taken to America and beyond as the Pronoia (psychology) tour.
In 1989 Fraser Clark and Marcus Pennell organised the first Zippie Picnic on Hampstead Heath in London, which continues to this day.