Boris Weisfeiler graduated from Moscow State University and received his Ph.D. from the Leningrad branch of the Steklov Institute in 1970. He immigrated to the United States in 1975. After spending a year at the Institute for Advanced Study in Princeton, N.J., Dr. Weisfeiler joined the faculty of the Mathematics Department of the Pennsylvania State University. He was a Professor of Mathematics there until his disappearance in January of 1985 while hiking in the Chilean Andes. The exact circumstances of his disappearance, though connected to the Chilean military dictatorship of 1973-1990, have not yet been clarified. The department subsequently established an annual lecture in Professor Weisfeiler's honor. Boris Weisfeiler is widely known for the Weisfeiler-Leman Algorithm, the Kac-Weisfeiler conjectures, the Weisfeiler filtration, and his work on strong approximation and on finite linear groups. The speakers have been A. Borel, J. Tits, D. Quillen, B. Mazur, G. Mackey, W. Feit, D. Kazhdan, V. Guillemin, J. Millson, E. Vinberg, and V. Kac.