Sean studied theatre design at Wimbledon School of Art, graduating in 1985 and then worked across the design spectrum, as a designer and assistant designer, in Opera, Dance, Theatre, film and television.
In 1993, he left London and returned to Wales to live in Swansea with his wife and four children. Over the past 18 years, he has designed over 150 productions for companies across UK and Europe. Including, Aberystwyth Arts Centre, The Wales Theatre Company, The Tron Theatre, Glasgow, The Grand Theatre, Swansea, The Torch Theatre, Milford, The Sherman Theatre Cardiff, Theatr Y Byd, Theatr Nanog, Script Cymru, The Hampstead Theatre London, The Soho Theatre London, The Birmingham Stage Company, Northampton Theatre Royal, St Pauli Theater Hamburg, The Hamburger Kammerspieler the Theater am Kurfürstendamm, Berlin, and The Danish Royal Opera.
He became Head of Design at The Royal Welsh College of Music, Drama in 1999 and was made an honorary fellow of the College in 2007. In 2008, he became Director of Drama, and in 2010, he became an Associate Director of the Torch theatre Milford Haven
He was Chair of the Association of Theatre Design Courses for 9 years, is a member of the Linbury Prize committee, and as Vice Chair of the OISTAT Education Commission, was Project Leader and designer for the Prague Quadrennial international student festival Scenofest, in 2007. In March 2011 he was the exhibition designer for the Society of British Theatre Designers national exhibition Transformation & Revelation held at RWCMD in Cardiff, March 2011. He became Chair of the Society of British Theatre Designers in September 2011 and has now working as the Project Leader for World Stage Design 2013 which will also be held in Cardiff.