Graddiodd Harry o Brifysgol Manceinion gyda gradd mewn Economeg, ac yna cymhwysodd i fod yn gyfrifydd gyda’r Swyddfa Archwilio Genedlaethol yn Ne Cymru, cyn symud ymlaen i Gyngor Sir Swydd Gaer. Gweithiodd gyda chyn Awdurdod Dŵr Cymru a Chyngor Sir Gwynedd. Yn dilyn ad-drefnu llywodraeth leol ym 1996, cafodd ei benodi’n drysorydd gyda Chyngor Gwynedd, a chafodd ei benodi’n Brif Weithredwr yn 2003 nes iddo ymddeol y llynedd.
Harry graduated from Manchester University with a degree in Economics and subsequently qualified as an accountant with the National Audit Office in South Wales before moving on to join Cheshire County Council. He has worked with the former Welsh Water Authority and Gwynedd County Council. After the 1996 Local Government reorganisation he was appointed Treasurer with Gwynedd Council and in 2003 was appointed Chief Executive where he remained until his retirement last year.