British pop producer/songwriter and owner of the Rokstone Studios in London, United Kingdom. The first song he wrote was Nomad's "(I Wanna Give You) Devotion" (1990), which was a UK #2-hit. Began his career in the music industry as a tape operator with producer Nigel Wright. Early in his career, Mac was known for writing, producing and remixing dance/house tracks until crossing over to pop/ballads with bands Boyzone, Westlife, and A1 in the late 1990's.
He mainly does ballads and has been responsible for more than 20 UK number-one hits and songs by bands like Undercover (as ''behind the scenes'' producer), A1, Boyzone, Westlife, Five, Ronan Keating, The Wanted, and The Saturdays. Nevertheless he keeps a low profile and does not seek out the media's attention.