M-K Thong is a Professor of Paediatrics and board-certified consultant clinical geneticist at the University of Malaya Medical Centre, Malaysia, providing genetic services and genetic counselling to paediatric and adult patients with hereditary conditions. He is engaged in medical education and research in birth defects, inborn errors of metabolism, cancer genetics and genetic counselling. He was a past President of the Asia-Pacific Society of Human Genetics, and the current President of the College of Paediatrics, Academy of Medicine of Malaysia