Brandon Marshall

Principal Investigator

Brandon is an Associate Professor of Epidemiology at the Brown University School of Public Health. He received a Ph.D. in epidemiology from the School of Population and Public Health at the University of British Columbia. During his doctoral training, he also worked at the British Columbia Centre for Excellence in HIV/AIDS. In 2011, he completed postdoctoral training at the Columbia University Mailman School of Public Health. Broadly, his research focuses on HIV/AIDS, substance use epidemiology, and the social, environmental, and structural determinants of health of urban populations.

Mark Lurie

Associate Professor of Epidemiology

Mark Lurie, PhD, is an infectious disease epidemiologist working on HIV/AIDS, sexually transmitted infections, silicosis and tuberculosis in sub-Saharan Africa. His current work focuses on training the next generation of social scientists in South Africa able to impact the HIV epidemic. Although he leads many projects outside of the Marshall Research Group, he offers the team valuable insight and recommendations throughout our many projects.

Maximillian King

Senior Research Programmer/Analyst

Max focuses on the modification and further development of our existing agent-based microsimulation model (TITAN), which investigates HIV prevention strategies for populations of injection and non-injection drug users. He creates and implements calibration and validation procedures; designs simulation experiments; conducts simulations on supercomputing cluster; prepares documentation of source code, operates instructions, and completes analyses; and assists our research team with interpreting model results. He recently completed his graduate studies in the Physics Department at Brown University.

Sarah Bessey

Research Programmer/Analyst

Sarah is a research associate at the Center for Population Health and Clinical Epidemiology at Brown University. They provide modeling support to students using TITAN, our agent based microsimulation model, and upkeep the day-to-day workings of TITAN model. They recently completed their MS in particulate transport and interaction at University of Wisconsin-Madison.

Carolyn Park

Research Associate

Carolyn is a Research Associate at the Centers for Epidemiology and Environmental Health at Brown University. She provides project management and analytic support for students and collaborators utilizing the TITAN model. She graduated from Yale School of Public Health with an MPH in infectious disease epidemiology. Throughout her time at Yale, she was able to gain experience at the state and local health departments, where she further developed her interests in community health research, substance use epidemiology, drug resistance and stewardship, and healthcare-associated infections.

Jesse Yedinak

Project Director

Jesse is the Project Director at the Center for Population Health and Clinical Epidemiology at Brown University, where she directs research projects related to substance use among young adults, opioid overdose, and HIV prevention. She helps the team by managing the grants that fund our Titan research and supervising the staff and students.

Brendan Jacka

Postdoctoral Research Associate

Brendan is the Postdoctoral Research Associate at the Center for Population Health and Clinical Epidemiology at Brown University. He received his PhD in molecular epidemiology from the Kirby Institute at UNSW Sydney in 2015. Since then, Brendan has completed postdoctoral training at the National Drug and Alcohol Research Centre (NDARC), UNSW Sydney and the Research Centre of the Centre hospitalier de l’Université de Montréal. His research interests are centered around the individual, social and structural determinants of health for people who use drugs, including the intersection of HIV and hepatitis C virus.

Maxwell Krieger

Data Manager

Max is a research assistant at the Center for Population Health and Clinical Epidemiology at Brown University. He supports the modelling team with website design, creating interactive tableaus, and conducting literature reviews. He has a strong interest in substance use, overdose prevention, and HIV prevention in Rhode Island.

Students on the Team

Joella Adams

Doctoral Candidate

Joella is a fifth-year doctoral student in the Department of Epidemiology at the Brown University School of Public Health. She is working on research examining the impact of mass incarceration on HIV acquisition risk for women. Her long term research goal is to develop a career as an infectious disease epidemiologist with a focus on women’s health and reducing HIV disparities, particularly those related to gender and race.

Focus: Women’s Health and HIV Disparities
Education: MPH, Drexel University School of Public Health

Jason Gantenberg

Doctoral Candidate

Jason is a fourth-year PhD student in the Department of Epidemiology at Brown University. His main interests involve infectious disease epidemiology in general and agent-based modelling. He hopes to apply complex systems concepts and thinking to further the study of disease transmission in populations.

Focus: HIV/AIDs, STDs, Agent-Based Modelling
Education: MPH, Loyola University Chicago; MA, DePaul University

William Goedel

Doctoral Candidate

Will is a third-year PhD Student in the Department of Epidemiology at Brown University. His primary research interests are related to the impact of biomedical HIV prevention strategies on HIV transmission among men who have sex with men. He hopes to pursue a career as a social epidemiologist with a focus on improving the health of sexual and gender minority populations.

Focus: Men who have sex with men, Pre-Exposure Prophylaxis
Education: BA, Global Public Health/Sociology, New York University

Alexandria Macmadu

Doctoral Student

Alex is a second-year PhD student in the in the Department of Epidemiology at the Brown University School of Public Health. Her primary research interests relate to opioid use disorder and overdose prevention. She hopes to one day develop a research program that examines the distribution and determinants of opioid-related harms and interventions to reduce these harms.

Focus: Opioid-related harms, harm reduction
Education: MSc, Brown University School of Public Health

Alyson Singleton

Master’s Student

Alyson is currently participating in the fifth-year master’s in Biostatistics program at Brown University. She has been with the group since her second-year as an undergraduate and works on a variety of projects, developing her modelling skill set and learning about infectious disease epidemiology. Her primary interest is using complex systems analysis to investigate transmission dynamics, with an end goal of impacting population health.

Focus: Infectious Disease Modelling
Education: Honors BS, Applied Mathematics, Brown University



    Daniel Escudero PhD, MPH (Postdoc. Fellow, Harvard Univ.)
    João Filipe Monteiro PhD (Postdoc. Fellow, Brown Univ.)
    Ayorinde Soipe MD, MSc (Sr. Clinical RA, Rhode Island Hospital.)