Marek Rutkowski is Professor of Mathematical Finance at the Warsaw University of Technology (Poland). He is an author of several research papers on stochastic processes and financial mathematics, which have appeared in numerous journals including: Mathematical Finance, Finance and Stochastics and Applied Mathematical Finance. He is a co-author, with Marek Musiela, of the monograph Martingale Methods in Financial Modelling published by Springer-Verlag in 1997. His recent fields of interest include the modelling of defaultable term structure, the valuation of credit derivatives, and the modelling of stochastic volatility. His joint monograph, with Tom Bielecki, entitled Credit Risk: Modeling, Valuation and Hedging was recently published by Springer-Verlag. Marek Rutkowski gained his PhD degree in mathematics in 1981, and his DSc degree in financial mathematics in 1998. He has also taught for several years at the University of New South Wales in Sydney He is currently with both the Warsaw University of Technology and the Institute of Mathematics of the Polish Academy of Sciences.