- (2012) Portrayed the female lead Hesione Hushabye in Shaw's 'Heartbreak House' at The Pearl Theater's inaugural event to celebrate their new Off-Broadway venue on 42nd St New York.
- (2011) Played Biddy Madigan in the Off-Broadway production of 'The Shaughraun' at The Irish Repertory Theater New York, where she is a company member. She received critical praise for her performance in the show: "Gwenfair Vaughan is very memorable as a professional mourner at a lurid funeral wake..." - ABC News, New York "Gwenfair Vaughan plays Biddy Madigan...that's worthy of the ticket price alone - Irish Voice New York
- (2004)
- Played the female lead Aysha in'The Cinnamon Moths' at Urban Stages Theater New York, for which she received critical praise for her "focused emotional portrayal".
- (1994) Acted in a production of 'Victoriana' at Clwyd Theatr Wales.
- (1993) Acted in a production of 'Gormod o Ddim/Too Much of a Good Thing' at Clwyd Theatr Wales.
- (1995 - 1998)
- She originated, and portrayed the female lead Ceridwen in the award winning 'Taliesin' theater show. The production was the recipient of 'The Waterford Audience Choice Award' at the Dublin International Theater Festival and went on to great touring success, performing in international theater festivals in Asia, Europe and North America, from 1995-1998.
- (2010) Portrayed multiple characters (including 1st Voice, Polly Garter, and Mrs Ogomre Pritchard) in'Under Milk Wood' by Dylan Thomas at The North Eastern Theater USA.
- (2004)
- She portrayed the title role in Strindberg's 'Miss Julie' at the Marilyn Monroe Theater in her New York stage debut.
- (2007) Played the title role in a theater production of 'Irma Bullock', part of the 'Tittle Tattle' drama series in the 'British Invasion Comedy Festival at Ars Nova, New York
- (2009) Portrayed the female lead Gweno in a concert reading of 'If I Should Go Away' in an evening of Welsh culture with Mind the Gap Theater, New York.
- (2016) Played First Voice in a benefit reading of Under Milk Wood for the Rutgers Homeless Shelter in New York City.
- (2008) Portrayed the female lead in a theater production of 'A Castle in a Meadow' in 'Brit Bits 2', New York British Short Play Festival with Mind the Gap Theater, New York.
- (2009) Portrayed the female lead in a theater production of 'I Heart Animals' in 'Brit Bits 5', New York British Short Play Festival with Mind the Gap Theater, New York
- (2008) Worked as an EMMYS presenter at The International Academy of Television Arts & Sciences.
- (2007) Voiced a promotional for Bank of America in New York.
- (2009) Performed a solo performance as Alice in a theater production of 'Turnham Greene' in 'Brit Bits in the Garden', British Short Play Festival with Mind the Gap Theater at The British Garden, New York.
- (2009) Performed a solo performance as Alice in a theater production of 'Turnham Greene' in 'Brit Bits 4', New York British Short Play Festival with Mind the Gap Theater, New York
- (2014) Voiced the female lead in a web series pilot for 'Rebaunt'.
- (2010) Portrayed Mrs Craticht in a theater production of 'A Christmas Carol' at The North Eastern Theater, USA.
- (2008) Portrayed the female lead in a theater production of 'One Lady Owner' in 'Brit Bits 3', New York British Short Play Festival with Mind the Gap Theater, New York.
- (2007) Hosted a 'New York Theater Guide' pilot for Wireless TV.
- (2007 - 2009) Worked as an EMMYS presenter for the The National Academy of Television Arts & Sciences.
- (2009) Read the female lead Stella in a reading of 'Company Along the Mile' & Samira Kreutzer in 'Perfect Mendacity' with Sternman Productions.
- (2006) Played female lead Duchess in 'Courtroom Drama' web series for Alltel.
- (2005) Portrayed female lead Siwan in a concert reading of 'The Royal Bed' with Origin Theater Company, New York.
- (2006) Played Megan in a concert reading of 'Cancer Time' with Mind the Gap Theater, New York.
- (2001) Portrayed female lead Rebecca in a theater production of 'Into the East' which regionally toured the UK, and for which she received critical praise for her 'moving dramatic performance'. The show was produced by Spectacle Theater.
- (2007) Played female lead Suzanne in a theatrical staging of 'Boundaries' in New York.
- (2002) Played female lead Mandy in a theater production of 'The Room' produced by Iolo Theater which regionally toured the UK.
- (2004) Portrayed female lead Blodeuwedd in a concert reading of 'A Woman of Flowers' at The New York International Theater Festival.
- (2005) Played the Welsh Bard in 'Cabaret Danzon', an international cabaret at La MaMa Theater, New York.
- (2006) Performed in 'Royal Coronations & Pageantry' alongside The Queen's Choir of St George's Chapel Windsor Castle, in a benefit for the British Garden New York, in memory of the UK 9/11 victims.
- (2007) Portrayed the female lead in a theater production of 'Joker Jim' in 'Brit Bits 1' New York British Short Play Festival with Mind the Gap Theater, New York
- (2003) Played Eastern Goddess in a theater production of 'The Lysistrata' in New York.
- (2000) Portrayed Zelda in 'Y Consuriwr/The Conjurer' animation series for S4C.
- (2002) Portrayed female lead Old Woman in a theater production of 'Journey' which played at The Lyric Hammersmith, London & toured the UK, produced by Iolo Theater.
- (2000) Narrated 'The Secret Papers' radio documentary series for the BBC.
- (2000) Portrayed multiple characters in 'Chwedlau'r Byd/World Tales animation series for S4C.
- (1999) Portrayed Megan in a theater production of 'Raw Women & Cooked Men' at the Warehouse Theater, London.
- (1996) Portrayed multiple characters in 'Wild Flowers' drama series for BBC Radio.
- (1991) Co-Hosted 'S4Bro' light entertainment television special for the S4C television network.
- (1997) Portrayed multiple characters in 'When Catherine Ferrier Died' drama series for BBC Radio.
- (1998) Portrayed multiple characters in 'Cwlwm Cam' drama series for BBC Radio.
- (1994) Hosted 'Jam Pot' educational series for BBC Radio.
- (1996) Hosted 'Clonc a Thonc' educational series for BBC Radio.
- (1999) Hosted 'The Basics of Language' educational series for BBC Radio.
- (1998) Portrayed Aphrodite in a theater production of 'Love' with E.L.A.N UK.
- (1997) Portrayed female lead Sian in a theater production of 'Sion Blewyn Coch' (Sion the Red Haired Fox), Welsh National Touring Christmas Show.
- (2007) She was an ensemble cast member in the 'Beginner's Welsh' audio guide for Hippocrene Books, New York
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