A 1982 graduate of Cardiff University (UK), he is a consultant paediatrician and neonatologist at Damansara Specialist Hospital. He is a Clinical Professor of Paediatrics at the KPJ International University College.

Since 1999, he has served on various international advisory boards related to vaccines and immunization. The latest in October 2021 on the mRNA Vaccines International Advisory Board.

He is a founding member of the Asian Strategic Alliance on the Prevention of Pneumococcal Disease (ASAP) and Immunise4Life. 

He is the chief-editor of FIMA Yearbook and sits on the advisory boards of MIMS Paediatrics and International Journal of Human & Health Sciences. His latest book “Immunisation Controversies – What you really need to know” has been translated into four languages.