Marcus is Professor Emeritus in Health Policy at the University of South Wales, and Deputy Chair of the Professional Standards Authority for Health and Social Care.
Mae Marcus yn Athro Emeritws ym maes Polisi Iechyd ym Mhrifysgol De Cymru, ac yn Ddirprwy Gadeirydd yr Awdurdod Safonau Proffesiynol ar gyfer Iechyd a Gofal Cymdeithasol.