Wilhelm Stoll, Duncan professor emeritus of mathematics at the University of Notre Dame, has been elected a fellow of the American Association for the Advancement of Science.p. A native of Freiburg, West Germany, Stoll was educated at the University of Tuebingen and taught there for six years. He joined the Notre Dame faculty in 1960, and was named the Vincent J. Duncan and Annemarie Micus Duncan Professor of Mathematics in 1988. He was a member of the mathematics department’s executive committee and served as department chair and director of graduate studies. He received the Graduate School Award from Notre Dame in 1992 for his tireless service to the mathematics department. He retired in 1994.p. A specialist in differentiable and complex manifolds, Stoll is known in his field for his thorough and lengthy articles, so well known, according to members of his department, that the standard unit of measurement for the length of publications has become the “Stoll,” with all other articles written measured in “micro-Stolls.”p. The American Association for the Advancement of Science is the leading general scientific organization in the United States. Its fellows are elected on the basis of distinguished advancements in science or its applications.