Best known to British audiences for his starring role in the 1978 drama series Hawkmoor, and appearances in the television series The District Nurse and the Doctor Who serial Revelation of the Daleks, Ogwen has been a stalwart of Welsh language television and film since the early 1970s. He has also written plays, presented documentary series and recorded readings of Welsh-language works. He was born and raised in Sling, Bethesda, North Wales, and studied English and Welsh at Bangor University.
When told, "You"ll have to make up your mind whether you want to be a nationalist or an actor", he replied, "I"ll be a bit of both." He has a keen interest in football, and played as a striker for Bangor City F.C. when still in the 6th Form at school.
Today he is a keen Everton F.C. supporter. They have three children, and live in Bangor.