Thoai Ngo, PhD, is the global director of the Poverty, Gender, and Youth Program and the Founding Director of the Girl Innovation, Research, and Learning (GIRL) Center at the Population Council. An epidemiologist based in New York City, his research focuses on the intersections between gender, health, and poverty globally. Ngo is an advisor to multilateral and bilateral donors, private foundations, universities, United Nations agencies, and governmental bodies in Asia and sub-Saharan Africa. Ngo sits on the editorial committee of Studies in Family Planning, serves as the board chair for Ibis Reproductive Health, and lectures at leading global health universities. He publishes widely in scientific journals and other media. Thoai is recognized as a 120 Under 40.