Peter Christoffersen is Professor of Finance at Rotman School of Management, Canada. He earned the PhD degree from University of Pennsylvania in 1996 after studies at the University of Copenhagen. His main research interests are in volatility modeling for option valuation as well as in developing backtesting procedures for risk management systems. He has published his research in leading finance and econometrics journals including Journal of Financial Economics, Journal of Econometrics, Management Science, and Review of Economics and Statistics. He is currently an associate editor of Journal of Applied Econometrics and the Journal of Risk.