KEMRI/Wellcome Trust, Kilifi, Kenya, University of Oxford

Stony Brook University

University of California, Berkeley

Associate Professor of Pharmacology, Florence University

New York State Institute for Basic Research in Developmental Disabilities

Research Professor, Estonian Institute for Population Studies, Tallinn University

research associate

Professor of international health

Reader, Paediatrics, College of Medicine, University of Ibadan and University College

Assistant Professor, UCSF