Yn ystod Haf 2022 cytunais i gomisiynu adolygiad annibynnol o’r system diogelu iechyd yng Nghymru. Cynhaliwyd yr adolygiad gan David Heymann – sy’n Athro Epidemioleg Clefyd Heintus yn Ysgol Hylendid a Meddygaeth Drofannol Llundain ac yn Bennaeth ar y Ganolfan ar Ddiogelwch Iechyd Byd-eang yn Chatham House, Llundain. O 2012 i fis Mawrth 2017, Heymann oedd Cadeirydd Public Health England. Cafodd ei gefnogi gan Sara Hayes a oedd gynt yn Gyfarwyddwr Iechyd y Cyhoedd ar Fwrdd Iechyd Prifysgol Abertawe Bro Morgannwg.
In Summer 2022 I agreed to commission an independent review of the health protection system in Wales. The review was conducted by David Heymann - Professor of Infectious Disease Epidemiology at the London School of Hygiene and Tropical Medicine and Head of the Centre on Global Health Security at Chatham House, London. From 2012 to March 2017, he was Chairman of Public Health England. David was supported by Sara Hayes who was formerly Director of Public Health at Abertawe Bro Morgannwg University Health Board.