Hugo Martin Montgomery Campbell (born 30 December 1950), formerly known as Mont Campbell, now Dirk Campbell is a British progressive rock musician, best known as a member of progressive rock band Egg. In his own words, he later "forswore the genre of rock music altogether, even the experimental variety (where can one find that now?) and began to develop an interest in folk tradition and, increasingly, non-western music."
Born to Mary Elizabeth Shaw ("Jackie") and Lieutenant Colonel H.A.L. Montgomery Campbell of the Royal Tank Regiment ("Archie"), in Ismaïlia, Egypt, Campbell was named Martin after his grandfather, the composer Martin Shaw. The family moved to Kenya in 1951, where they lived until their return to the UK in 1962, their son having preceded them by a year. In 1966, the family moved from Brighton to London where Campbell attended the City of London Boys School. While at school he met guitarist Steve Hillage and keyboardist Dave Stewart, whereupon the three formed the band Uriel in early 1968. Following Hillage's departure, the band changed its name to "Egg". Campbell played bass guitar in the group and was its main composer, citing Igor Stravinsky as his main influence.
By 1972 Campbell had become interested in mysticism and was involved in the Subud movement. He left Egg and attended the Royal College of Music, studying the French horn and composition. He reunited with his former Egg bandmates for their final album "The Civil Surface" in 1974, which consisted of unreleased material from 1971–72, including what many view as his masterpiece in the progressive rock canon, Enneagram. He also played and composed for the Ottawa Music Company, a large ensemble co-led by Dave Stewart and Chris Cutler, which brought together members of Egg, Henry Cow and Khan, along with other composers and instrumentalists.