[1] Gray grew up in Bangor in Northern Ireland and was assistant organist at St George's Church, Belfast, before moving to England at the age of 18 for an organ scholarship at Pembroke College, Cambridge, where he studied with Nicolas Kynaston and David Sanger.

As a postgraduate student at the Royal College of Music, he was taught by Margaret Phillips and held an organ scholarship at Guildford Cathedral, working with Stephen Farr and Geoffrey Morgan.

[1] Gray was appointed Assistant Director of Music at Truro Cathedral in 2000 and Organist and Master of the Choristers in 2008.

[2] In 2022 it was announced that he would succeed Andrew Nethsingha as Director of Music at St John's College, Cambridge, in 2023.

[1] Gray appeared on the ITV television programme Britain's Got Talent in 2019, conducting the Truro choristers in "Can You Feel the Love Tonight", which was composed by Elton John for the animated film The Lion King.