Ceri trained at WCMD and has designed lighting for National Theatre Wales, The Torch Theatre, University of Southern California, Catrin Finch, The Sherman Theatre, Fiery Angel, Royal and Derngate Northampton, Birmingham Stage Company, Colchester Mercury Theatre, Salisbury Playhouse, Oxford Touring Theatre, Unicorn Theatre London, National Youth Theatre Wales, Derby Playhouse, Leicester Haymarket, Dalier Sylw, Clwyd Theatr Cymru, Theatr Genedlaethol Cymru, Theatr na n'Óg, Dragons Breath Theatre, FAB Theatre, Shock n Awe, New Vic Theatre, Theatr Bara Caws, Hijinx Theatre, Made in Wales and BBC NOW. He worked for 8 years as production manager for Cardiff Festival and is a founding member of Mappa Mundi Theatre, and has worked on many of their productions for the past 20 years.