Dr. Pachankis studies the mental health of sexual and gender minority individuals. He developed a highly-cited model of stigma concealment, which has been used to understand the reasons that people conceal stigmatized identities and the psychological costs of doing so. He also studies the psychological impact of stigma and discrimination on sexual and gender minority mental health over the lifespan. Drawing on his background as a clinical psychologist, he has translated this research into some of the first evidence-based mental health treatments for LGBT individuals. He has tested the delivery of these treatments via novel technologies (e.g., smartphones), in diverse settings (e.g., Eastern Europe), and with diverse segments of the LGBT community (e.g., rural youth). He is the recipient of the 2017 Distinguished Contributions to Knowledge award of the American Psychological Association’s Division 44.