Abigail Greenleaf, PhD, joined the Mailman School of Public Health in 2019. Abba is a public health demographer whose research focuses on collecting data in low- and middle-income countries. She is interested in survey research methods and using technology across a variety of public health topics. She currently works for ICAP's Population-Based HIV Impact Assessment (PHIA) survey. Carried out under the leadership of the Ministries of Health, PHIA data benchmark a country's progress towards controlling the AIDS epidemic and inform targeted policies and programs. Abba teaches a graduate course at the Mailman School of Public Health, “Research Design” and will teach a data science course for undergraduates examining health equity in New York City beginning Fall 2020.