Richard ParkerRichard Parker is Professor in the Institute of Social Medicine at the State University of Rio de Janeiro and the Sociomedical Sciences Division of the Joseph L. Mailman School of Public Health at Columbia University, as well as Director of th Brazilian Interdisciplinary AIDS Association (ABIA). Regina Maria Barbosa is Coordinator of Research on Women's Health at the Institute of Health and a Research Scientist at the Center for Population Studies at the University of Campinas in São Paulo. Peter Aggleton is Professor at the Institute of Education at the University of London. Read More Read Less