Prior to retirement Brenig was a Further Education College Vice Principal. His career in education included teaching in University College Cardiff and as a Development Officer in the Government’s FE Unit. Currently, he serves on several educational boards as a Governor, covering primary, secondary and further education. He is also a Director of a Wales examining body. In addition he is an Assessor for the Association of Colleges Beacon Awards and a Reader for the Further and Higher Education Queen’s Awards.