Stephen Tollman (pictured) is the Director of the MRC/Wits Rural Public Health & Health Transitions Research Unit (Agincourt). Tollan is also a research professor and the head of the Division of Health and Population in the School of Public Health at the University of the Witwatersrand, Johannesburg.
Kathleen Kahn is a professor in health and population division in the School of Public Health at the University of Witwatersrand, Johannesburg. She is also a senior scientist at the MRC/Wits Rural Public Health and Health Transitions Research (Agincourt).