Robert Engle is an expert in time series analysis with a long-standing interest in the analysis of financial markets. His ARCH model and its generalizations have become indispensable tools not only for researchers, but also for analysts of financial markets.  Many of these methods are now featured in the innovative public web site, V-LAB, where daily estimates of volatilities and correlations for more than a thousand assets can be found.  These forecasts use both traditional and...