Healthcare AI · Medical imaging · Physics

Arkadiusz Sitek

Research Scientist and Physicist

Massachusetts General Hospital | Harvard Medical School

I develop AI methods that connect biomedical data with clinical practice. My research spans medical imaging, electronic health records, omics, physiological time series, and behavioral data, with the aim of improving patient care.

A current focus is patient health timeline modeling: learning from clinical events to simulate possible health trajectories. This work includes ETHOS and adaptive risk estimation, alongside open data standards for reproducible healthcare AI.

“Science is the belief in the ignorance of experts.”

— Richard Feynman
Explore my research

Selected work

Recent publications

All publications on Google Scholar

2026

  1. NEJM AI, 3(6), 2026 · Review Article

    MEDS — An Emerging Data Standard and Ecosystem for Health AI Research

    Matthew B. A. McDermott, Ethan Steinberg, Jason A. Fries, Robin P. van de Water, Chao Pang, Patrick Rockenschaub, Pawel Renc, Jungwoo Oh, Kamilė Stankevičiūtė, Justin Xu, Tom J. Pollard, Nassim Oufattole, Michael Wornow, Teya S. Bergamaschi, Hyewon Jeong, Simon A. Lee, Vincent Jeanselme, Kiril V. Klein, Mikkel Odgaard, Maria E. Montgomery, Arkadiusz Sitek, Mads Nielsen, Jeffrey N. Chiang, Noa Dagan, Isaac Kohane, Shalmali Joshi, Edward Choi, and Nigam H. Shah

    The Medical Event Data Standard (MEDS) provides a shared, open-source foundation for health AI research. This review describes the standard, its growing ecosystem, and its role in reproducible workflows and foundation model development.

    DOI: 10.1056/AIra2501253

2025

  1. GigaScience, Volume 14, 2025

    Foundation model of electronic medical records for adaptive risk estimation

    Pawel Renc, Michal K. Grzeszczyk, Nassim Oufattole, Deirdre Goode, Yugang Jia, Szymon Bieganski, Matthew B. A. McDermott, Jaroslaw Was, Anthony E. Samir, Jonathan W. Cunningham, David W. Bates, and Arkadiusz Sitek

    ETHOS-ARES uses patient health timelines to estimate changing clinical risks without task-specific fine-tuning. The framework supports adaptive risk assessment from electronic health records using the MEDS data format.

    Figure from Foundation model of electronic medical records for adaptive risk estimation