Laurent C. Siebenmann

Laurent C. Siebenmann
Laurent Siebenmann at the IHÉS, 2007
Born	1939 Toronto, Ontario, Canada
Nationality	Canadian
Alma mater	University of Toronto Princeton University
Awards	Jeffery–Williams Prize
Scientific career
Fields	Mathematics
Institutions	University of Paris-Sud
Doctoral advisor	John Milnor
Doctoral students	Francis Bonahon Albert Fathi

Laurent Carl Siebenmann (the first name is sometimes spelled Laurence or Larry) (born 1939) 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 at the Centre national de la recherche scientifique in 1976. He is a topologist who works on manifolds and who co-discovered the Kirby–Siebenmann class.