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 have also been fortunate to be supported by the Ermenegildo Zegna Founder's Scholarship.

My research focuses on trustworthy decision-making from heterogeneous data sources. In many scientific problems, evidence comes from heterogeneous sources such as randomized experiments, observational studies, and flexible machine learning models (aka foundation models). These sources often have complementary strengths and weaknesses, and I develop statistical methods to combine them in ways that make the causal conclusions drawn from data more robust and efficient.

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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