Bernard Teissier

{{short description|French mathematician}}

{{Infobox scientist

| name = Bernard Teissier

| image = Bernard Teissier2.jpg

| image_size =

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| birth_date = {{birth year and age|1945}}

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| nationality = French

| fields = Mathematics

| workplaces = Paris Diderot University
Paris-Sud 11 University
University of Tehran

| alma_mater = Paris Diderot University

| doctoral_advisor = Heisuke Hironaka

| doctoral_students = François Loeser
David Trotman

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}}

Bernard Teissier ({{IPA|fr|tɛsje}}; born 1945)[https://books.google.com/books?id=bigQvHvkF_YC&hl= Plane algebraic curves] by Gerd Fischer, American Mathematical Soc., 2001, p. 229 is a French mathematician and a member of the Nicolas Bourbaki group. He has made major contributions to algebraic geometry and commutative algebra, specifically to singularity theory, multiplicity theory{{cite web|url=https://indico.math.cnrs.fr/event/202/contributions/967/attachments/562/615/2015-Popescu-Pampu-Aussois.pdf|format=PDF|title=How Teissier mixed multiplicities|author=Patrick Popescu-Pampu|website=Indico.math.cnrs.fr|access-date=7 March 2022}}{{cite web|url=https://indico.math.cnrs.fr/event/202/contributions/954/attachments/558/611/2015-Gaffney-Ausois.pdf|format=PDF|title=Families of Isolated Singularities and Three Inspirations from Bernard Teissier|author=Terence Gaffney|website=Indico.math.cnrs.fr|access-date=7 March 2022}} and valuation theory.

Teissier attained his doctorate from Paris Diderot University in 1973, under supervision of Heisuke Hironaka.{{MathGenealogy |id=13781}} He was a member and a leading figure of Nicolas Bourbaki.{{citation|title=Bourbaki: a secret society of mathematicians|first=Maurice|last=Mashaal|publisher=American Mathematical Society|year=2006|page=18|isbn=978-0-8218-3967-6|url=https://books.google.com/books?id=-CXn6y_1nJ8C&pg=PA18}}. Along with Alain Connes, he gave the 1975/1976 Peccot Lectures. He was an invited speaker at the International Congress of Mathematics at Warsaw in 1983.{{Cite web|url=http://www.mathunion.org/db/ICM/Speakers/SortedByLastname.php|title=International Mathematical Union (IMU)|website=Mathunion.org|access-date=7 March 2022|archive-date=24 November 2017|archive-url=https://web.archive.org/web/20171124141541/http://www.mathunion.org/db/ICM/Speakers/SortedByLastname.php|url-status=dead}}

In 2012, he became a fellow of the American Mathematical Society.[http://www.ams.org/profession/fellows-list List of Fellows of the American Mathematical Society], Ams.org, retrieved 2013-08-25.