Margaret Kruk, MD, MPH, is the Distinguished Endowed Professor of Health Systems and Medicine at WashU Medicine. Kruk is the director of the Quality Evidence for Health System Transformation (QuEST) Network, a multi-country research consortium working to produce a global evidence base for improving health systems. She is also director of the WashU QuEST Center. Kruk and her team use implementation science and econometric methods to design and evaluate large-scale health system reforms.