Mr Mawby was educated at Westminster Cathedral Choir School becoming assistant at the organ at 12 years of age. He would eventually return to Westmister in 1961 as Master of Music. He also held the position of Choral Director at the Irish State Broadcaster, Radio Telefís Éireann.
Pope Benedict XVI bestowed the membership of the Ordo Sancti Gregorii Magni on him in 2006.
Composing many liturgical pieces, Mr Mawby also wrote a number of secular works.
Colin Mawby was a patron of the Latin Mass Society.
Requiescat in pace.