Tanya is interested in how to improve the effective coverage of high quality reproductive, maternal, newborn and child health care, primarily in sub-Saharan Africa. Her work has included investigations into family planning preferences, delivery strategies of insecticide treated mosquito nets for the prevention of anaemia and malaria in pregnancy, and understanding the effectiveness of innovations designed to improve maternal and newborn health. Through this work Tanya has placed emphasis on the use of evidence for evaluation concurrently with its use for programme improvement, working with project, district and national level actors to support data-informed decision making. Tanya currently supervises three PhD students, all of whom investigate issues of measurement or health care delivery for girls, women, and newborns in low-income settings.