Dr. Daniel Westreich

Daniel Westreich, PhD

Department of Epidemiology
2105C McGavran Greenberg Hall
CB #7435
Chapel Hill, NC 27599


Dr. Daniel Westreich is a professor of epidemiology at the University of North Carolina at Chapel Hill's Gillings School of Global Public Health. He received his PhD in epidemiology from UNC-Chapel Hill in 2008.

Substantively, his research investigates the intersection of HIV with reproductive health. This work has elucidated relationships between pregnancy and response to antiretroviral therapy, clarified methodology for studying the potential impact of hormonal contraception on acquisition of HIV. He is currently a PI of the STAR Cohort of reproductive-age HIV-positive and -negative women, and a co-investigator on the MACS-WIHS Combined Cohort Study. He also studies issues related to COVID-19, and the intersection of HIV and chronic disease.

Methodologically, Dr. Westreich’s research focuses on methods in causal inference, and epidemiologic methods for implementation science. In 2014 he was awarded an NIH DP2 New Innovator award for the development of such methods. He is the author of the textbook Epidemiology By Design: A Causal Approach to the Health Sciences (https://www.epidemiologybydesign.com/), is an associate editor of the American Journal of Epidemiology and sits on the editorial board of Epidemiology.

To learn more about Dr. Westreich’s research, you can also visit his PubMed bibliography, or his Google Scholar homepage.

Daniel Westreich in the Gillings News

Honors and Awards

NIH New Innovator Award
2014, NIH

Brian MacMahon Early Career Epidemiologist Award
2014, Society for Epidemiologic Research

Representative Courses

Fundamental of Epidemiology, EPID 710 | Syllabus

Research Activities

  • HIV and women's reproductive health
  • HIV and smoking
  • Women's reproductive health

Service Activities

  • Associate editor, American Journal of Epidemiology
  • Editorial board, Epidemiology
  • Methods Section Editor, Current Epidemiology Reports

Key Publications

Commentary: epidemiology in the era of big data. A El-Sayed, S Mooney, D Westreich (2015). Epidemiology (Cambridge, Mass.), 26(3), 390-4.

The Impact of Implementation Fidelity on Mortality Under a CD4-Stratified Timing Strategy for Antiretroviral Therapy in Patients With Tuberculosis. F Behets, J Eron, M Nana, M Patel, A Van Rie, D Westreich, M Yotebieng (2015). American journal of epidemiology, 181(9), 714-22.

Antibiotic treatment of diarrhoea is associated with decreased time to the next diarrhoea episode among young children in Vellore, India. L Adair, S Becker-Dreps, G Kang, D Kattula, S Meshnick, E Rogawski, R Sandler, R Sarkar, H Ward, D Westreich (2015). International journal of epidemiology.

All your data are always missing: incorporating bias due to measurement error into the potential outcomes framework. S Cole, J Edwards, D Westreich (2015). International journal of epidemiology.

Epidemiology's Continuing Contribution to Public Health: The Power of "Then and Now". M Bloom, G Buck Louis, N Gatto, C Hogue, D Westreich, C Zhang (2015). American journal of epidemiology, 181(8), e1-8.

Comparison of pharmacy-based measures of adherence to antiretroviral therapy as predictors of virological failure. M Brookhart, C Henegar, P Majuba, M Maskew, W Miller, A Van Rie, D Westreich (2015). AIDS and behavior, 19(4), 612-8.

Effect of pregnancy and the postpartum period on adherence to antiretroviral therapy among HIV-infected women established on treatment. M Brookhart, C Henegar, M Maskew, W Miller, A Van Rie, D Westreich (2015). Journal of acquired immune deficiency syndromes (1999), 68(4), 477-80.

Treatment to Prevent HIV Transmission in Serodiscordant Couples in Henan, China, 2006 to 2012. M Cohen, W He, H Liu, W Miller, M Smith, N Wang, L Wang, D Westreich, J Zhou, L Zhu (2015). Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

Ten-year Survival by Race/Ethnicity and Sex Among Treated, HIV-infected Adults in the United States. A Adimora, S Cole, D Drozd, J Edwards, J Eron, M Kitahata, C Lesko, J Martin, W Mathews, W Miller, R Moore, M Mugavero, D Westreich (2015). Clinical infectious diseases : an official publication of the Infectious Diseases Society of America.

The Effect of Early Life Antibiotic Exposures on Diarrheal Rates Among Young Children in Vellore, India. L Adair, S Becker-Dreps, G Kang, D Kattula, S Meshnick, E Rogawski, R Sandler, R Sarkar, H Ward, D Westreich (2015). The Pediatric infectious disease journal.

Risk. M Brookhart, S Cole, M Hudgens, D Westreich (2015). American journal of epidemiology, 181(4), 246-50.

A cautionary note about estimating effects of secondary exposures in cohort studies. K Ahrens, S Cole, R Platt, E Schisterman, D Westreich (2015). American journal of epidemiology, 181(3), 198-203.


  • BS, Computer science, Yale College, 1998
  • MSPH, Epidemiology, UNC-CH, 2005
  • PhD, Epidemiology, UNC-CH, 2008