Christopher A. Sims is an American economist known for his significant contributions to the field of macroeconomics. He was awarded the Nobel Prize in Economic Sciences in 2011, sharing the honor with Thomas Sargent for their work on understanding the effects of economic policy through the use of vector autoregressions. Sims is a professor at Princeton University, where he has influenced many students and researchers. His research focuses on the relationship between economic variables and the importance of using statistical methods to analyze economic data. His work has helped shape modern approaches to economic modeling and policy analysis.