Michael N. Liebman is chief scientific officer of the Windber Research Institute in southern Pennsylvania. He has directed computational biology, bioinformatics and genomics programs@the University of Pennsylvania Cancer Center, Roche Pharmaceuticals, Wyeth Pharmaceuticals, Vysis Incorporated and the Amoco Technology Company. Liebman serves on a number of commercial, governmental and nonprofit advisory boards, including the Human Health and Medicinal Chemistry Commission of the IUPAC. Address: Windber Research Institute, 600 Somerset Avenue, Windber, PA 15963. Internet: m.liebman@wriwindber.org