Laurent C. Siebenmann
Encyclopedia
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 an influential 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
.
Toronto
Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. A relatively modern city, Toronto's history dates back to the late-18th century, when its land was first purchased by the British monarchy from...
) is a Canadian mathematician
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....
based at the Université de Paris-Sud at Orsay
Orsay
Orsay is a commune in the Essonne department in Île-de-France in northern France. It is located in the southwestern suburbs of Paris, France, from the center of Paris.Inhabitants of Orsay are known as Orcéens.-History:...
, France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan 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 an influential topologist who works on manifolds and who co-discovered the
Kirby–Siebenmann class. His undergraduate studies were at the University of Toronto
University of Toronto
The University of Toronto is a public research university in Toronto, Ontario, Canada, situated on the grounds that surround Queen's Park. It was founded by royal charter in 1827 as King's College, the first institution of higher learning in Upper Canada...
. He received a Ph.D. from Princeton University
Princeton University
Princeton University is a private research university located in Princeton, New Jersey, United States. The school is one of the eight universities of the Ivy League, and is one of the nine Colonial Colleges founded before the American Revolution....
under the supervision of John Milnor
John Milnor
John Willard Milnor is an American mathematician known for his work in differential topology, K-theory and dynamical systems. He won the Fields Medal in 1962, the Wolf Prize in 1989, and the Abel Prize in 2011. Milnor is a distinguished professor at Stony Brook University...
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
Jeffery–Williams Prize
The Jeffery–Williams Prize is a mathematics award presented annually by the Canadian Mathematical Society. The award is presented to individuals in recognition of outstanding contributions to mathematical research. The first award was presented in 1968...
by the Canadian Mathematical Society
Canadian Mathematical Society
The Canadian Mathematical Society is an association of professional mathematicians dedicated to the interests of mathematical research and education in Canada.It was originally conceived in June 1945 as the Canadian Mathematical Congress...
.