Dr. Hall is the Founding Director of the Center for Global Health Equity and a tenured Full Professor of Global Public Health at NYU Shanghai, with an affiliation at New York University's School of Global Public Health.

Hall was the inaugural Global Mental Health Fellow of the World Health Organization (WHO) and co-developed new cultural sections for the ICD-11. He helped formulate the WHO's scalable mental health program, including Step-by-Step, a digital intervention he adapted for Overseas Filipino Workers and Chinese young adults. He has also consulted on digital mental health innovations with the Asian Development Bank and the WHO.

His research includes early studies of the African community in Guangzhou, China, exploring social networks, HIV, mental health, and discrimination. His team also conducted the first large-scale studies of transnational Filipino and Indonesian domestic workers, examining social determinants of various health outcomes. He is currently a co-PI on a $1.3 million, five-country grant investigating healthcare barriers for diverse migrant populations.

An authority on public mental health and migration, Hall served as a Commissioner on the Lancet Commission for Mental Health in China, publishing the first review of China’s MHPSS response. He advised on the WHO Future of Mental Health in the Western Pacific Region and now leads the Migration, Displacement, and Climate Change Research Agenda Setting work for the region with the WHO.

Hall has received numerous awards, including the APA Award for Distinguished Contributions to Psychology in the Public Interest. He is an elected Fellow of the American Psychological Association and an inductee into the Delta Omega Honorary Society for Public Health. Hall has co-authored over 340 journal articles and is a Clarivate 1% highly cited researcher. He currently serves as the Editor-in-Chief of Epidemiology and Psychiatric Sciences.