I am a PhD student in the Computer Science Department at ETH Zürich, advised by Fanny Yang, and part of the Institute for Machine Learning. I was previously an Applied Scientist Intern at Amazon Science in Seattle, where I worked on machine learning and experimentation to select the best offers for customers. Before that, I was a visiting graduate student at Harvard University, hosted by Issa Dahabreh in the CAUSALab.

I am broadly interested in reliable decision-making from multiple heterogeneous data sources. For example, leveraging AI models to combine randomized and observational evidence with the goal of improving efficiency and generalization.

My current research focuses on trial augmentation, a framework that improves the efficiency of clinical trials by safely incorporating external data through flexible AI models.

Selected Publications

Efficient Randomized Experiments Using Foundation Models
Piersilvio De Bartolomeis, Javier Abad, Guanbo Wang, Konstantin Donhauser, Raymond M. Duch, Fanny Yang, and Issa J. Dahabreh
Advances in Neural Information Processing Systems (NeurIPS), 2025
Trial Emulation, Simulation, and Augmentation Using Electronic Health Records and Generative AI
Issa J. Dahabreh, Robert W. Yeh, and Piersilvio De Bartolomeis
NEJM AI, 2025
Hidden Yet Quantifiable: A Lower Bound for Confounding Strength Using Randomized Trials
Piersilvio De Bartolomeis*, Javier Abad*, Konstantin Donhauser, and Fanny Yang
International Conference on Artificial Intelligence and Statistics (AISTATS), 2024

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