Mary Ann Chiasson

Mary Ann Chiasson

Mary Ann Chiasson

Professor of Clinical Epidemiology
Epidemiology (in Medicine)


630 West 168th St, PH 8-West, Room 876
New York NY 10032
Website address: Email:


Dr. Mary Ann Chiasson's research focuses on the epidemiology of HIV, particularly risk factors for sexual transmission; women's reproductive health; and early childhood obesity. Her current HIV-related research focuses on the relationship between the Internet and high risk sexual behavior among men who have sex with men and she directs the online video prevention project, HIV Is Still A Big Deal. She co-directed the HIV/AIDS Epidemiology course at the Mailman School from 1989-2015. Dr. Chiasson served in various capacities at the New York City Department of Health from 1986 through 1999, including nine years as an assistant commissioner of health with scientific and administrative responsibility for AIDS Surveillance, HIV/AIDS Research, and Vital Statistics and Epidemiology. From 1999-2018 Dr. Chiasson was vice president for research and evaluation at Public Health Solutions (PHS), a large non-profit organization that provides health-related services, conducts demonstration and research programs, and offers management services in order to improve community health and strengthen health policy.



DrPH, 1988, Columbia University
MPH, 1985, Columbia University
MS, 1978, New York University
BA, 1972, Bennington College

Other Affiliations

Fellow, New York Academy of Medicine
Member, Hermann Biggs Society 2002-2004

Areas of Expertise

Longitudinal Studies, Research Design and Methods, Infant Mortality, Underserved Populations, Weight Control, HIV/AIDS, Sexually Transmitted Infections, Infectious Disease, Family Planning, Reproductive Health, Sex Education and Safe Sex

Select Urban Health Activities

CHAIN Study, Chairman of the Technical Review Team: The CHAIN study appraises the system of care in New York City from the perspective of people living with HIV and AIDS. CHAIN has evolved into one of the most comprehensive client-based HIV prospective cohort studies launched by any metropolitan area in the US.
Obesity in Children Participating in the Public Health Solutions New York City Neighborhood WIC Program: The Public Health Solutions Research and Evaluation Unit has conducted two surveys to determine the prevalence of obesity and associated risk factors among children 2-4 years old enrolled in this WIC program which serves more than 55,000 women, infants, and children each year. The findings from these surveys are being used to age-appropriate interventions.
Health literacy, cervical cancer screening, and access to care among immigrant Latina women in New York City: This is a project exploring links between health literacy and cervical cancer screening in Latinas age 40 and over of varying nationalities in New York City.

Select Publications

Hirshfield S, Grov C, Parsons JT, Anderson I, Chiasson MA .Social media use and HIV transmission risk behavior among ethnically diverse HIV-positive gay men: results of an online study in three U.S. states. Arch Sex Behav. 2015 Oct;44(7):1969-78. doi: 10.1007/s10508-015-0513-5. Epub 2015 Jul 16. PMID:26179596
Habel MA, Scheinmann R, Verdesoto E, Gaydos C, Bertisch M, Chiasson MA. Exploring pharmacy and home-based sexually transmissible infection testing. Sexual Health. 2015 Sep 28. doi: 10.1071/SH15031. [Epub ahead of print] PMID:26409484
Ellman TM, Hawkins K, Benitez J, Negron R, Chang S, Palmer S, Robertson V, Chiasson MA, Sobieszczyk ME. Representation of Latinos and Blacks in screening for and enrollment into preventive HIV vaccine trials in New York City. Vaccine. 2015 Oct 11. pii: S0264-410X(15)01381-X. doi: 10.1016/j.vaccine.2015.09.091. [Epub ahead of print] PMID:26458799
Chiasson MA, Scheinmann R, Hartel D, McLeod N, Sekhobo J, Edmunds LS, and Findley S. Predictors of obesity in a cohort of children enrolled in WIC as infants and retained to three years of age. J Community Health. 2016. Feb;41(1):127-33. doi: 10.1007/s10900-015-0077-2. PMID:26280211
Garbers S, Friedman A, Martinez O, Scheinmann R, Bermudez D, Silva M, Silverman J, Chiasson MA. Adapting the Get Yourself Tested Campaign to Reach Black and Latino Sexual-Minority Youth.Health Promot Pract. 2016 May 24. pii: 1524839916647329. [Epub ahead of print] PMID:27225216
Hirshfield S, Downing MJ Jr, Parsons JT, Grov C, Gordon RJ, Houang ST, Scheinmann R, Sullivan PS, Yoon IS, Anderson I, Chiasson MA. Developing a Video-Based eHealth Intervention for HIV-Positive Gay, Bisexual, and Other Men Who Have Sex with Men: Study Protocol for a Randomized Controlled Trial. JMIR Res Protoc. 2016 Jun 17;5(2):e125. doi: 10.2196/resprot.5554.PMID:27315764
Teasdale CA, Abrams EJ, Chiasson MA, Justman J, Blanchard K, Jones HE. Sexual Risk and Intravaginal Practice Behavior Changes During Pregnancy. Arch Sex Behav. 2016 Sep 6. [Epub ahead of print ]PMID: 27600836
Lieff SA, Bangia D, Baronberg SJ, Burlette A, Chiasson MA. Farm to WIC!: Evaluation of an Educational Initiative to Promote Shopping at Farmers’ Markets among WIC Participants in New York City. J Community Health (2016). doi:10.1007/s10900-016-0306-3
Koblin BA, Nandi V, Hirshfield S, Chiasson MA, Hoover DR, Wilton L, Usher D, Frye V. Informing the development of a mobile phone HIV testing intervention: Intentions to use specific HIV testing approaches among young black transgender women and men who have sex with men. JMIR Public Health and Surveill 2017. Jul 7;3(3):e45. doi: 10.2196/publichealth.7397. PMID:28687531
Thomann M, Zapata R, Grosso A, Chiasson MA. “WTF is PrEP?”: Attitudes towards Pre-Exposure Prophylaxis among men who have sex with men and transgender women in New York City. Culture, Health & Sexuality, DOI:1o.1080/13691058.2017.1380230.

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