Best known as the younger sibling of famous Beatles singer and songwriter Paul McCartney, he also had a career, under the pseudonym of Mike McGear, as a musician and photographer.
During the Beatles' rise to fame, he was working as a hairdresser and performing with a Liverpool-based comedy troupe called The Scaffold. When the Beatles began to tour internationally, he accompanied his brother's band as a photographer.
His 1974 single, "Leave It" / "Sweet Baby," reached # 36 on United Kingdom music charts.
He was raised in Liverpool, England, by Mary and Jim McCartney.
He was the brother-in-law of Linda McCartney.