Background
He was born in Brussels, Belgium and immigrated with his parents to New York City in 1950 and grew up largely in this city.
He was born in Brussels, Belgium and immigrated with his parents to New York City in 1950 and grew up largely in this city.
Princeton University.
Their work includes many results in knot theory (and broad generalizations of that subject) and aspects of low-dimensional topology. They gave the first nontrivial examples of topological conjugacy of linear transformations, which led to a flowering of research on the topological study of spaces with singularities. More recently, they combined their understanding of singularities, first to lattice point counting in polytopes, then to Euler-Maclaurin type summation formulae, and most recently to counting lattice points in the circle.
This last problem is a classical one, initiated by Gauss, and the paper is still being vetted by experts.
In 2012 he became a fellow of the American Mathematical Society.
In 1963, as a senior at the Bronx High School of Science, he won first place in the Westinghouse Science Talent Search for his work on "The Theory of Semi-cyclical Groups with Special Reference to Non-Aristotelian Logic." He is best known for his "codimension one splitting theorem", which is a standard tool in high-dimensional geometric topology, and a number of important results proven with his collaborator Julius Shaneson (now at the University of Pennsylvania).
American Mathematical Society.
