Robert F. Engle is an American economist known for his significant contributions to the field of econometrics. He was awarded the Nobel Prize in Economic Sciences in 2003 for developing the ARCH model (Autoregressive Conditional Heteroskedasticity), which helps analyze and forecast financial market volatility. Engle's work has had a profound impact on how economists and financial analysts understand risk and uncertainty in economic data. His research is widely used in various fields, including finance, economics, and statistics, making him a prominent figure in modern economic analysis.