Gary was born in Pembrokeshire in 1972, and was raised in Narberth, Clynderwen and Bridgend.
He was educated at Brynteg Comprehensive School, Sidney Sussex College, Cambridge, and at the European Film College in Ebeltoft, Denmark.
He lives in Splott.
Blackthorn. A new play for Clwyd Theatr Cymru, opens autumn 2010.
Love Steals Us From Loneliness. A new play for National Theatre Wales, opens in Bridgend autumn 2010.
Voices Wales. An oral history project, funded by a Creative Wales Award from ACW.
Paradise for Sale. A new play for the National Theatre of Scotland.
Untitled. A new play for Watford Palace Theatre.
Crazy Gary's Mobile Disco. Paines Plough and Sgript Cymru.
The Shadow of a Boy. Royal National Theatre. Winner, Meyer Whitworth Award, joint winner, George Devine Award.
The Drowned World. Paines Plough. Winner, Fringe First; joint winner, Pearson Best Play Award.
Amser Canser. Royal Welsh College of Music and Drama. Produced in English as Cancer Time by Theatre 503.
SK8. Young Company, The Drum, Plymouth.
Ghost City. Sgript Cymru.
An Enemy for the People. RuthIsStrangerThanRichard/Chapter Stiwdio in association with Sgript Cymru.
We That Are Left. Watford Palace Theatre.
Mary Twice. Bridgend County Youth Theatre.
Big Hopes. National Theatre Education/Prince's Trust.
Amgen:Broken. A play in Welsh and English for Sherman Cymru.
A Christmas Carol. A new adaptation of Dickens, for Sherman Cymru. December, 2009.
Bulletproof. A verbatim play for Replay Productions, Belfast January 2010.
The Ugly Truth. Devised with Sarah Argent, Hannah McPake and Shekira Johnson, Theatr Iolo, February 2010.
Free Folk. A new play for Forest Forge. February 2010.
Mrs Reynolds and the Ruffian. A new play for the Watford Palace Theatre. April, 2010.
Spring Awakening. A free adaptation of Wedekind, for the Royal Welsh College of Music and Drama. May 2010.