Paul R. Rosenbaum, PhD is the Robert G. Putzel Professor of Statistics at the Wharton School at the University of Pennsylvania, where he has worked since 1986. He is the author of Observation and Experiment: An Introduction to Causal Inference (Harvard University Press, 2017), Observational Studies (2nd edition 2002) and Design of Observational Studies (2010), both in the Springer Series in Statistics. With Donald Rubin, Dr. Rosenbaum invented the propensity score in 1983. In 2003, he received the George Snedecor Award from the Committee of Presidents of Statistical Societies (COPSS). In 2017, he received the Nathan Mantel Award from the Section on Statistics in Epidemiology of the American Statistical Association. In 2018, he received the Long-Term Excellence Award from the Health Policy Statistics Section of the American Statistical Association. In 2019, he received the R.A. Fisher Award from the Committee of Presidents of Statistical Societies (COPSS). He earned his PhD in Statistics from Harvard University.