Anastasios N. Angelopoulos

Co-founder and CEO of Arena.

My research contributes to the foundations of machine learning and statistics with a focus on reliable AI.

Previously, I was a Postdoctoral Scholar at UC Berkeley, working with Ion Stoica.

Before that, I did my Ph.D. in EECS at UC Berkeley, advised by Michael I. Jordan and Jitendra Malik.

I did my undergraduate degree in EE at Stanford University.

For a complete list of publications, see my Google Scholar.

Books

• Theoretical Foundations of Conformal Prediction
  A. N. Angelopoulos, R. F. Barber, S. Bates. Cambridge University Press, forthcoming 2026.
• Conformal Prediction: A Gentle Introduction
  A. N. Angelopoulos, S. Bates. Foundations and Trends in Machine Learning, 2023.

Selected Papers

• Prediction-Powered Inference
  A. N. Angelopoulos, S. Bates, C. Fannjiang, M. I. Jordan, T. Zrnic. Science, 2023.
• Conformal Risk Control
  A. N. Angelopoulos, S. Bates, A. Fisch, L. Lei, T. Schuster. ICLR, 2024.
• Chatbot Arena: An Open Platform for Evaluating LLMs by Human Preference
  W. Chiang, L. Zheng, Y. Sheng, A. N. Angelopoulos, T. Li, D. Li, H. Zhang, B. Zhu, M. I. Jordan, J. E. Gonzalez, I. Stoica. ICML, 2024.
• Prompt-to-Leaderboard
  E. Frick, C. Chen, J. Tennyson, T. Li, W. Chiang, A. N. Angelopoulos, I. Stoica. ICML, 2025.