He was the founding editor of Ptolemaic Terrascope magazine from 1989 until 2005, at which time management of the publication was handed over to Pat Thomas in North America.
McMullen also founded the semi-annual Terrastock indie rock festivals which have taken place in North America (and once in London, England) since 1987.
There has also been a series of concerts staged under the name Terrascope Audio Entertainments.
Phil lives in the West of England and in addition to owning and operating The Ptolemaic Press writes primarily about psychedelic, improvised, experimental rock and folk music.
In an interview published in 2005 Nick Saloman of the band The Bevis Frond praised McMullen and describe him as "one of that rare breed, a music fan who doesn't want to be a musician".