About Me

I’m a PhD candidate in The CHOICE Institute at the University of Washington. My dissertation is focused on using advanced statistical methods to better understand the causal mechanisms underpinning the relationship between out-of-pocket payments, adherence, and outcomes in cancer patients on Medicare Part D.

Prior to my doctoral training, I received a Master's in health economics and worked as a health economist specializing in decision-analytic modeling at The Johns Hopkins Bloomberg School of Public Health.

I've also acted as a health economics consultant in industry and non-profit settings and my work has been featured in Health Affairs, Bulletin of the World Health Organization, and Fred Hutchinson Cancer Research Center's Science Spotlight Series.

Research Interests

  • Adherence

  • Drug pricing

  • Intersection of machine learning and causal inference

  • Statistical methods for complex longitudinal data

  • Decision science

  • Health economics

Skills

  • Programming languages: R, Stata, SAS, SQL, VBA

  • Analytic experience: machine learning, prediction modeling, causal inference, decision-analytic modeling (CEA, ROI, BIA, VOI)

  • Topic-area expertise: cancer research, drug pricing, infectious disease, and medication adherence.

Selected publications

Clark S, Marcum Z, Radich J, Bansal A. Predictors of tyrosine kinase inhibitor adherence trajectories in patients with newly diagnosed chronic myeloid leukemia. Journal of Oncology Pharmacy Practice. December 2021;27(8):1842-1852.

Ozawa S, Clark S, Portnoy A, Grewal S, Stack M, Sinha A, Mirelman A, Franklin H, Friberg I, Tam Y, Walker N, Clark A, Ferrari M, Suraratdecha C, Sweet S, Goldie S, Garskie T, Li M, Hansen P, Johnson H, Walker D. Estimated economic impact of vaccinations in 73 low- and middle-income countries, 2001–2020. Bulletin of the World Health Organization. September 2017; 95(9): 629-638.

Ozawa S, Clark S, Portnoy A, Grewal S, Brenzel L, and Walker D. Return on investment from childhood immunization in Low- And Middle-Income Countries, 2011–20. Health Affairs. February 2016; 35(2):199-207