Nickolas D. Zaller, PhD, is an Assistant Professor of Medicine in (Research) at the Alepert Medical School and Research Associate at The Miriam Hospital. Dr. Zaller has a strong background in conducting research among substance using and marginalized populations and experience in study design, implementation and data analysis work on numerous federally funded studies. Dr. Zaller received his PhD training at the Johns Hopkins Bloomberg School of Public Health and completed a two-year NIDA-sponsored T32 clinical research post doctoral training fellowship at The Miriam Hospital. Dr. Zaller's research interests include: access to addiction treatment and support services for out of treatment drug using populations at high-risk for HIV infection; role of pharmacies in providing HIV prevention related services to substance users and other marginalized populations; linkage to HIV primary care and substance use treatment upon release from correctional settings; alternatives to incarceration for substance using populations; and integration of behavioral and primary healthcare. Recent projects on which Dr. Zaller is a lead or co-Investigator include four NIDA funded R01 studies among substance using populations in the correctional setting, the Open Society Institute funded Closing the Addiction Treatment Gap Initiative which seeks to expand resources for drug addiction focusing on improving efficiencies in treatment delivery and diversion of individuals away from corrections into community based drug treatment, the CDC funded RARx overdose and prevention response study and the Brown Global Health Initiative funded study examining sexual health among female migrant workers in China. Dr. Zaller has also served as either Project Director or lead evaluator on three SAMHSA funded Targeted Expansion Capacity (TCE) grants to expand and enhance substance use treatment among marginalized substance users at risk for HIV infection. Additionally, Dr. Zaller is part of the evaluation team of the HRSA funded multi-site project EnhanceLink which provides linkage to HIV care upon release from jail settings.