Professor Timothy Davis has made many key contributions to the clinical management of diabetes and malaria. He runs the Fremantle Diabetes Study which has provided unique epidemiological insights into diabetes management and complications, has contributed to transformative diabetes intervention trials, and has been actively involved in formulating local and national treatment policies and guidelines. His malaria research in Oceania, Asia and Africa has generated pharmacokinetic and outcome data that have influenced malaria treatment guidelines in children and pregnant women. He has mentored many clinicians and researchers, and has assisted with capacity building in the tropical countries in which he has worked.