Developmental Psychologist and Distinguished Professor at the University of the Witwatersrand and the Director of the Department of Science and Technology (DST) – National Research Foundation (NRF) Centre of Excellence in Human Development. NRF A-rated scientist. Advisor to the World Health Organization on early child development. Research Associate in the Department of Psychiatry at the University of Oxford. Honorary appointments at the University of Melbourne (2003-2006) and Harvard University (2007-2010)From 2010-2012 Advisor on Vulnerable Children at the Global Fund to Fight AIDS, Tuberculosis and Malaria in Geneva.