Sion is a hugely experienced screen, stage, radio and voiceover actor. Best known for roles in PHONESHOP and THE INDIAN DOCTOR. Welsh language TV credits include leading roles in DIM OND Y GWIR and TIR for S4C.
His many theatre credits include the highly acclaimed one-man show LAST CHRISTMAS, which he has performed at the Edinburgh Fringe, the Soho Theatre and on tour. He has also worked with National Theatre Wales, Bristol Old Vic, Theatr Genedlaethol Cymru and over 20 productions for Clwyd Theatr Cymru.
He is regularly heard in BBC radio dramas, and has most recently been involved in the BBC Radio 3 adaptation of THREE SISTERS, AUGUST 1914 and THE TSARS OF RUSSIA season.