Sean Tomlin, PhD

Sean Tomlin, PhD

Biostatistician | Causal Inference

Biography

I am a biostatistician specializing in causal inference for quasi-experimental designs, with a research focus on matching, weighting, and regression methods for complex, multilevel observational studies, particularly in settings with repeated measures. My work aims to resolve open methodological problems in difference-in-differences (DiD) designs and to advance causal inference thinking in regulatory science, clinical research, and real-world evidence generation.

I received my PhD in Biostatistics in August 2025 from The Ohio State University. My dissertation, Estimating Causal Effects from Observational Data in Quasi-Experimental Designs, addressed several open problems in DiD methodology for healthcare utilization studies, including the controversial practice of matching on pre-intervention outcomes, structural zeros in DiD designs, and limitations of retrospective survey data for causal inference under common constraints such as omission of confounders. This work was recognized with the American Statistical Association’s 2026 GSS/SSS/SRMS Student Paper Award.

I am currently a Biostatistician at Medpace, where I lead statistical and programming activities across multiple clinical trials, including developing analysis plans, selecting methodology, and preparing statistical reporting for regulatory submission. This applied clinical trials experience directly informs my methods research, grounding my work in the practical constraints and open questions that arise in real-world regulatory and clinical settings.

Interests
  • Causal inference
  • Constrained optimization
  • Quasi-experimental designs
  • Survey methods
  • Comparative effectiveness research
  • Clinical trials
Education
  • PhD in Biostatistics, 2025

    The Ohio State University

  • MS in Statistics, 2022

    The Ohio State University

  • BS in Statistics, 2020

    Wright State University

Recent & Upcoming Talks

Upcoming

  • Characterizing Retrospective Constraints of Survey Designs for Estimating Population-level Causal Effects. Oral Presentation, GSS/SSS/SRMS Student Paper Competition Award Winner. Joint Statistical Meetings, Boston, MA, 2026 [Slides]

Recent

  • Counterpart Statistics in the Matched Difference-in-Differences Design. Oral presentation: Joint Statistical Meetings, Nashville, TN, 2025
  • Counterpart Statistics in the Matched Difference-in-Differences Design. Poster presentation: American Causal Inference Conference, Detroit, MI, 2025
  • Revisiting Covariate Adjustment in Parametric Difference-in-Differences. Oral presentation: ENAR Spring Meeting 2025, New Orleans, LA.

Recent Publications

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