David L. Heymann (born 1946) is an American infectious disease epidemiologist and public health expert, based in London.
Heymann did two years of practical epidemiology training with the Epidemic Intelligence Service, during which time Heymann was part of the international team that investigated the first outbreak of Ebola in Zaire (with Peter Piot, Karl Johnson, Joel Breman, Joe McCormick amongst others) and the first outbreak of Legionnaire's disease, in Philadelphia.
Heymann is visiting professor in the department of medicine at the National University of Singapore, and an associate provost (health affairs).
Before joining WHO, Heymann worked for 13 years as a medical epidemiologist in sub-Saharan Africa on assignment from the US Centers for Disease Control and Prevention.
On 5 August 2020, Heymann was deployed as part of a WHO "surge team" in South Africa to help strengthen the national and provincial responses to COVID-19.