[2] I got into music kind of by default as it was the only thing I was good at – I was the weird one at school who practiced the piano during lunch break.

[5] In the 1990s, Gregory performed with artists including Peter Gabriel, the Cure, and Portishead, as well as playing oboe for Tori Amos and recording with Paula Rae Gibson.

The libretto by Hattie Naylor focused on Auguste Piccard and Paul Kipfer's first balloon ascent, and the theories of Albert Einstein and Isaac Newton, both of whom are characters in the drama.

[9] On 11 March 2013, a newly commissioned baroquesque Gregory work (for orchestra and Moog, based on a sarabande of Johann Sebastian Bach) was performed at the Roundhouse in London.

[15][16] It was announced in 2021 that Gregory would provide an original score featuring Alison Goldfrapp and Adrian Utley for the BBC and Amazon Prime Video psychological thriller series Chloe.