He has played a crucial role in being the Welsh voice around the table with other UK Chief Medical Officers, government departments and organisations.
Mae wedi chwarae rhan hanfodol o ran rhoi llais i Gymru o gwmpas y bwrdd gyda Phrif Swyddogion Meddygol eraill y DU, adrannau'r llywodraeth a sefydliadau.