1. Asistant Professor, Maternal and Child Health, The Johns Hopkins University School of Hygiene and Public Health; and Instructor in Pediatrics, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21205
2. Research Associate, Grace Department of Research, British American Hospital, Lima, Peru
3. Associate Director of Research, Grace Department of Research; and Assistant Professor of International Health, The Johns Hopkins University School of Hygiene and Public Health
4. Professor of Human Nutrition, The Johns Hopkins University School of Hygiene and Public Health; Associate Professor of Pediatrics, The Johns Hopkins Medical Institutions; and Director of Research, Grace Department of Research