Dr. Liyang Sun is an econometrician with research interests in causal inference and weak identification. She primarily focuses on developing new methods for causal inference in a more realistic setting of treatment effects heterogeneity. She has also contributed research on weak identification with many instruments. She is a Lecturer in the Department of Economics at University College London and an Untenured Associate Professor (on leave) at CEMFI. Previously she was a Postdoctoral Research Fellow at UC Berkeley. She received her Ph.D in Economics and Statistics from MIT in 2021, and her B.A. in Economics and Mathematics from Wellesley College in 2014.