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His current interests focus on research ethics, public health ethics and medical ethics in developing countries, primarily in sub-Saharan Africa. He is co-Principal Investigator of two NIH/Fogarty International Center bioethics capacity building projects in Central Francophone Africa and South Africa. At UNC, he teaches bioethics to medical students in the School of Medicine. He is also co-Principal Investigator of a research study on the ethical and social implications of [[HIV]] cure research, with study sites in the [[USA]], [[China ]] and South Africa. He is currently also co-investigator in a NIH study on responsible conduct of [[HIV]] research among adolescents in Kenya. He has published on many bioethics themes, including [[informed consent]], [[HIV]] testing policies, medical rationing, implementation ethics, research involving children, health surveillance, health inequality and social justice. He was co-lead author of the [[HIV]] Prevention Trials Network (HPTN) Ethical Guidance for Research (2009). He has conducted qualitative research on community attitudes towards male [[circumcision ]] as means of [[HIV]] prevention in Malawi, and has published about the ethical dimensions of this public health intervention.<ref>{{REFdocument