Bu David yn arwain ar ddatblygu Coleg Glannau Dyfrdwy, sydd wedi cynnwys canlyniadau arolygu Gradd 1, a phroses uno lwyddiannus gyda Choleg Garddwriaeth Cymru yn 2009 a Choleg Llysfasi yn 2010.  Cafodd ei benodi’n ddiweddar yn Bennaeth/Prif Weithredwr (Dynodi) Coleg Cambria, y coleg newydd a gaiff ei ffurfio yn dilyn uno Coleg Glannau Dyfrdwy a Choleg Iâl, Wrecsam ym mis Awst 2013.
David has played a leading role in the development of Deeside College, which has included Grade 1 inspection outcomes and successful mergers with the Welsh College of Horticulture in 2009 and Coleg Llysfasi in 2010. He has recently been appointed at Principal/Chief Executive (Designate) of Coleg Cambria, the new college that will be formed following the merger between Deeside College and Yale College, Wrexham in August 2013.