X. SHELDON LIN, PhD, ASA, is Professor of Actuarial Sciences in the Department of Statistics, University of Toronto. He is an Associate of the Society of Actuaries and an Associate Editor for North American Actuarial Journal and Insurance: Mathematics and Economics. Dr. Lin's research interests include mathematical finance, actuarial science, and applied probability. He is an author or coauthor of more than 40 research papers in these areas. He jointly received two annual prizes of the Society of Actuaries in 1998 and 2004 for his research in actuarial science.