Mae Dr Fenton yn Neonatolegydd Ymgynghorol yn Newcastle ers 1995. Mae wedi chwarae rhan bwysig yn y gwaith o ddatblygu gwasanaethau amenedigol ar y lefel genedlaethol a bu'n Llywydd Cymdeithas Meddygaeth Amenedigol Prydain yn 2014-17. Ef oedd y neonatolegydd yn nhîm craidd yr Adolygiad Mamolaeth Cenedlaethol (Genedigaethau Gwell) 2016 ac mae'n aelod o Gyngor Rhanddeiliaid y Rhaglen Trawsnewid Mamolaeth. Mae’n ymwneud â rhaglen gydweithredol MBRRACE-UK ers 2018.
Dr Fenton has been a Consultant Neonatologist in Newcastle since 1995. He has had a major role in developing perinatal services at the national level and was President of the British Association of Perinatal Medicine 2014-17. He was the neonatologist in the core team of the 2016 National Maternity Review (Better Births) and is a member of the Maternity Transformation Programme Stakeholder Council. He has been part of the MBRRACE-UK collaborative since 2018.