Research and Evaluation Staff

Mary Ann Chiasson, DrPH, joined Public Health Solutions as the Vice President for Research & Evaluation in 1999.

Previously, she served for fourteen years in various capacities at the New York City Department of Health, 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. Her research interests and expertise include the epidemiology of HIV and STIs, women's reproductive health, and early childhood obesity.

Her HIV/STI related research focuses on the relationship between the Internet and high-risk sexual behavior among men who have sex with men (MSM). Since 2001, she has focused more broadly on how digital media can be harnessed to improve contraceptive counseling for women and the delivery of HIV and obesity prevention interventions.

To contact Dr. Chiasson, please click here.

Sabina Hirshfield, PhD is a Senior Research Scientist with expertise in internet-based recruitment, research and video-based interventions with vulnerable populations, including sexual minorities and those living with HIV. Her training is in social sciences and epidemiology, which has enabled her to conduct theoretically-based HIV prevention research and interventions, most of which have been online, with both HIV-negative and HIV-positive populations. Through her online work, she has reached thousands of individuals and has established a solid publication record in the HIV prevention field.

To contact Dr. Hirshfield, please click here.

Ashley Grosso, PhD is a social scientist with primarily quantitative research experience in HIV epidemiology and prevention and reproductive health studies in the United States and sub-Saharan Africa. Her research has focused on populations at high risk including men who have sex with men and female sex workers.

She is particularly interested in adolescent health and has conducted analyses of sex education in urban public high schools, differences between adolescent and adult contraception preferences, and the age of initiation of risks and vulnerabilities including alcohol use, sexual debut, and selling sex.

With her academic training in public administration, she has also completed research on the determinants, effectiveness, and equity of funding for HIV-related services in the United States and internationally.

To contact Dr. Grosso, please click here.

Martin J. Downing, PhD is an environmental psychologist and research scientist with Public Health Solutions. His research focuses on psychosocial and contextual factors of health and well-being, particularly at the intersection of sexual behavior, substance use, and HIV/STI prevention.

Dr. Downing has expertise in quantitative and qualitative methods of data collection and analysis, Internet-based recruitment and survey administration, and video-based HIV prevention interventions.

To contact Dr. Downing, please click here