[2] A few years after relocating to Australia, McMartin co-founded Trafalgar Records with Charles Fisher, a studio that signed artists and bands including Radio Birdman, Robyn Archer, 1927 and Gyan Evans.

He served as chairman and then executive director of the International Music Managers Forum.

McMartin was a board member of the Support Act, a music industry charity, for 19 years,[2] from 1997 to 2016.

[4] McMartin received the APRA Ted Albert Award in 2007[2] and the Medal of the Order of Australia in 2015.

McMartin died at a hospital in Berry, New South Wales on 31 March 2024, 19 days after his 79th birthday, after having suffered from cancer.