Laurent C. Siebenmann

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Laurent Siebenmann at the IHÉS, 2007

Laurent Carl Siebenmann (the first name is sometimes spelled Laurence or Larry) (born in 1939 in Toronto) is a Canadian mathematician based at the Université de Paris-Sud at Orsay, France.

After working for several years as a Professor at Orsay he became a Directeur de Recherches in the French CNRS in 1976. He is a topologist who works on manifolds and who co-discovered the Kirby–Siebenmann class. His undergraduate studies were at the University of Toronto. He received a Ph.D. from Princeton University under the supervision of John Milnor in 1965 with the dissertation The Obstruction to Finding a Boundary for an Open Manifold of Dimension Greater than Five. His doctoral students at Orsay included Michel Boileau, Francis Bonahon, Albert Fathi, Lucien Guillou, Alexis Marin and Jean-Pierre Otal.

In 1985 he was awarded the Jeffery–Williams Prize by the Canadian Mathematical Society.[1] In 2012 he became a fellow of the American Mathematical Society.[2]

Selected publications[edit]


  1. ^ "Jeffery-Williams Prize". Retrieved 2017-03-14. 
  2. ^ List of Fellows of the American Mathematical Society, retrieved 2013-07-20.

External links[edit]