A graduate of Oxford University, he holds a PhD in Epidemiology and a Master of Public Health from Harvard University, where he studied as a Fulbright Scholar.
Yn raddedig o Brifysgol Rhydychen, mae ganddo PhD mewn Epidemioleg a gradd meistr mewn Iechyd Cyhoeddus o Brifysgol Harvard, lle bu'n astudio fel Ysgolor Fulbright.