# Sergiu Klainerman

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{{short description|Romanian American mathematician}}
{{Infobox scientist
| name        = Sergiu Klainerman
| image       = Sergiu Klainerman.jpg <!--(filename only, i.e. without "File:" prefix)-->
| image_size  = 220px
| alt         = 
| caption     = Sergiu Klainerman in 1978
| birth_date  = {{birth date and age |1950|5|13|mf=y}}
| birth_place = [Bucharest](/source/Bucharest), [Romanian People's Republic](/source/Socialist_Republic_of_Romania)
| death_date  =         <!--{{death date and age |YYYY|MM|DD |YYYY|MM|DD}} (death date then birth date)-->
| death_place = 
| fields      = [Mathematics](/source/Mathematics)
| workplaces  = [University of California, Berkeley](/source/University_of_California%2C_Berkeley)<br>[New York University](/source/New_York_University)<br>[Princeton University](/source/Princeton_University)
| alma_mater  = [University of Bucharest](/source/University_of_Bucharest)<br>[New York University](/source/New_York_University)
| thesis_title      = Global Existence for Nonlinear Wave Equations
| thesis_url        = https://bobcat.library.nyu.edu/permalink/f/ci13eu/nyu_aleph001044164
| thesis_year       = 1978
| doctoral_advisors = [Fritz John](/source/Fritz_John)<br>[Louis Nirenberg](/source/Louis_Nirenberg)
| doctoral_students = [Gustavo Ponce](/source/Gustavo_Ponce)
| known_for   = 
| awards      = [Bôcher Prize](/source/B%C3%B4cher_Prize) (1999)<ref name="bocher">[http://www.ams.org/notices/199904/comm-bocher-prz.pdf 1999 Bôcher Prize] {{Webarchive|url=https://web.archive.org/web/20120716181222/http://www.ams.org/notices/199904/comm-bocher-prz.pdf |date=2012-07-16 }}, [Notices of the American Mathematical Society](/source/Notices_of_the_American_Mathematical_Society), vol. 46 (1999), no. 4, pp. 463-466</ref>
}}

'''Sergiu Klainerman''' (born May 13, 1950) is a [mathematician](/source/mathematician) known for his contributions to the study of [hyperbolic differential equation](/source/hyperbolic_differential_equation)s and [general relativity](/source/general_relativity). He is currently the [Eugene Higgins](/source/Eugene_Higgins) Professor of Mathematics at [Princeton University](/source/Princeton_University), where he has been teaching since 1987.

==Biography==
He was born in 1950 in [Bucharest](/source/Bucharest), [Romania](/source/Romania), into a [Jewish](/source/Jews) family. After attending the [Petru Groza High School](/source/Tudor_Vianu_National_College_of_Computer_Science),<ref name="Ziare">{{cite news|url=https://ziare.com/international/stiri-internationale/sergiu-klainerman-nu-este-suficient-sa-aparam-libertatea-de-exprimare-si-neutralitatea-o-strategie-de-aparare-a-culturii-occidentale-e-necesara-1629593|title=Sergiu Klainerman: Nu este suficient să apărăm libertatea de exprimare și neutralitatea. O strategie de apărăre a culturii occidentale e necesară|lang=ro|publisher=Ziare.com|date=September 7, 2020|access-date=August 16, 2024}}</ref> he studied mathematics at the [University of Bucharest](/source/University_of_Bucharest) from 1969 to 1974. For graduate studies he went to [New York University](/source/New_York_University), obtaining his [Ph.D.](/source/Doctor_of_Philosophy) in 1978.<ref name="vita">{{cite web| url=https://web.math.princeton.edu/~seri/homepage/SergiuCV.pdf|title=Sergiu Klainerman's Curriculum Vitae}}</ref> His thesis, written under the direction of [Fritz John](/source/Fritz_John) and [Louis Nirenberg](/source/Louis_Nirenberg), was titled ''Global Existence for Nonlinear Wave Equations''.<ref>{{MathGenealogy |id=18856}}</ref> From 1978 to 1980 Klainerman was a [Miller Research Fellow](/source/Miller_Research_Fellows) at the [University of California, Berkeley](/source/University_of_California%2C_Berkeley), while from 1980 to 1987 he was a faculty member at New York University's [Courant Institute of Mathematical Sciences](/source/Courant_Institute_of_Mathematical_Sciences), rising in rank to Professor in 1986.<ref name="vita" />

Klainerman is a member of the [U.S. National Academy of Sciences](/source/U.S._National_Academy_of_Sciences) (elected 2005),<ref>[https://www.ams.org/notices/200507/people.pdf National Academy of Sciences elections], [Notices of the American Mathematical Society](/source/Notices_of_the_American_Mathematical_Society), vol. 52 (2005), no. 7, p. 764</ref> a foreign member of the [French Academy of Sciences](/source/French_Academy_of_Sciences) (elected 2002)<ref>[http://www.academie-sciences.fr/membres/K/Klainerman_Sergiu.htm Sergiu Klainerman bio page] {{Webarchive|url=https://web.archive.org/web/20091129083838/http://www.academie-sciences.fr/membres/K/Klainerman_Sergiu.htm |date=2009-11-29 }}, [French Academy of Sciences](/source/French_Academy_of_Sciences). Accessed January 13, 2010.</ref> and a Fellow of the [American Academy of Arts and Sciences](/source/American_Academy_of_Arts_and_Sciences) (elected 1996).<ref>[http://www.ams.org/notices/199607/people.pdf American Academy Elections.] {{Webarchive|url=https://web.archive.org/web/20160303225244/http://www.ams.org/notices/199607/people.pdf |date=2016-03-03 }} [Notices of the American Mathematical Society](/source/Notices_of_the_American_Mathematical_Society), vol. 43 (1996), no. 7, p. 781</ref> In 2003, he was awarded the [Romanian Order of Merit](/source/National_Order_of_Merit_(Romania)), Commander rank.<ref>{{citation| url=https://legislatie.just.ro/Public/DetaliiDocument/44401| title=Decret nr. 370 din 11 iunie 2003| language=ro|work=[Monitorul Oficial](/source/Monitorul_Oficial)| issue=420|date=June 16, 2003|access-date=May 28, 2025}}</ref> He was elected to the 2018 class of [fellow](/source/fellow)s of the [American Mathematical Society](/source/American_Mathematical_Society).<ref>{{citation|url=http://ams.org/profession/ams-fellows/new-fellows|title=2018 Class of the Fellows of the AMS|publisher=[American Mathematical Society](/source/American_Mathematical_Society)|access-date=2017-11-03}}</ref>

He was named a [MacArthur Fellow](/source/MacArthur_Fellow) in 1991<ref>[http://www.macfound.org/site/c.lkLXJ8MQKrH/b.1142705/k.28E8/Fellows_List__July_1991.htm MacArthur Fellows, July 1991] {{webarchive|url=https://web.archive.org/web/20070929090935/http://www.macfound.org/site/c.lkLXJ8MQKrH/b.1142705/k.28E8/Fellows_List__July_1991.htm |date=2007-09-29 }}, [MacArthur Foundation](/source/MacArthur_Foundation). Accessed January 13, 2010.</ref> and [Guggenheim Fellow](/source/Guggenheim_Fellow) in 1997.<ref>[http://www.gf.org/fellows/all?index=k&page=10 Fellows list], {{webarchive|url=https://web.archive.org/web/20110603234941/http://www.gf.org/fellows/all?index=k&page=10 |date=2011-06-03 }} [Guggenheim Foundation](/source/John_Simon_Guggenheim_Memorial_Foundation). Accessed January 13, 2010.</ref>
Klainerman was awarded the [Bôcher Memorial Prize](/source/B%C3%B4cher_Memorial_Prize) by the American Mathematical Society in 1999  "for his contributions to nonlinear hyperbolic equations".<ref name="bocher"/> He is currently a co-Editor-in-Chief of [Publications Mathématiques de l'IHÉS](/source/Publications_Math%C3%A9matiques_de_l'IH%C3%89S).<ref>[https://www.ihes.fr/jsp/site/Portal.jsp?page_id=29 Editorial Board], [Publications Mathématiques de l'IHÉS](/source/Publications_Math%C3%A9matiques_de_l'IH%C3%89S). Accessed January 13, 2010</ref>

==Major publications==
*{{Cite journal|last=Klainerman|first=Sergiu|year=1980|title=Global existence for nonlinear wave equations|journal=[Communications on Pure and Applied Mathematics](/source/Communications_on_Pure_and_Applied_Mathematics)|volume=33|issue=1|pages=43–101|doi=10.1002/cpa.3160330104|mr=0544044}}
*{{Cite journal|last1=Klainerman|first1=Sergiu|last2=Majda|first2=Andrew|author2-link=Andrew Majda|year=1981|title=Singular limits of quasilinear hyperbolic systems with large parameters and the incompressible limit of compressible fluids|journal=Communications on Pure and Applied Mathematics|volume=34|issue=4|pages=481–524|doi=10.1002/cpa.3160340405|bibcode=1981CPAM...34..481K|mr=0615627}}
* Klainerman, Sergiu; Majda, Andrew. ''Compressible and incompressible fluids.'' Comm. Pure Appl. Math. 35 (1982), no. 5, 629–651. 
* Klainerman, Sergiu. ''Global existence of small amplitude solutions to nonlinear Klein-Gordon equations in four space-time dimensions.'' Comm. Pure Appl. Math. 38 (1985), no. 5, 631–641.
* Klainerman, Sergiu. ''Uniform decay estimates and the Lorentz invariance of the classical wave equation.'' Comm. Pure Appl. Math. 38 (1985), no. 3, 321–332.
* Klainerman, S. ''The null condition and global existence to nonlinear wave equations.'' Nonlinear systems of partial differential equations in applied mathematics, Part 1 (Santa Fe, N.M., 1984), 293–326, Lectures in Appl. Math., 23, Amer. Math. Soc., Providence, RI, 1986.
* Klainerman, S.; Machedon, M. ''Space-time estimates for null forms and the local existence theorem.'' Comm. Pure Appl. Math. 46 (1993), no. 9, 1221–1268.
* Klainerman, S.; Machedon, M. ''Smoothing estimates for null forms and applications.'' A celebration of John F. Nash, Jr., [Duke Mathematical Journal](/source/Duke_Mathematical_Journal) 81 (1995), no. 1, 99–133 (1996).
* Klainerman, Sergiu; Sideris, Thomas C. ''On almost global existence for nonrelativistic wave equations in 3D.'' Comm. Pure Appl. Math. 49 (1996), no. 3, 307–321.

==Books==
* [Christodoulou, Demetrios](/source/Demetrios_Christodoulou); Klainerman, Sergiu. ''The global nonlinear stability of the Minkowski space.'' Princeton Mathematical Series, 41. [Princeton University Press](/source/Princeton_University_Press), Princeton, NJ, 1993. x+514 pp. {{ISBN|0-691-08777-6}}
* Klainerman, Sergiu; Nicolò, Francesco. ''The evolution problem in general relativity.'' Progress in Mathematical Physics, 25. Birkhäuser Boston, Inc., Boston, MA, 2003. xiv+385 pp. {{ISBN|0-8176-4254-4}}

==References==
{{reflist}}

==External links==
*[http://www.math.princeton.edu/~seri/ Sergiu Klainerman personal webpage], Department of Mathematics, [Princeton University](/source/Princeton_University)

{{Authority control}}

{{DEFAULTSORT:Klainerman, Sergiu}}
Category:1950 births
Category:Living people
Category:Scientists from Bucharest
Category:Romanian Jews
Category:University of Bucharest alumni
Category:20th-century American mathematicians
Category:21st-century American mathematicians
Category:20th-century Romanian mathematicians
Category:Members of the French Academy of Sciences
Category:Members of the United States National Academy of Sciences
Category:Princeton University faculty
Category:Courant Institute of Mathematical Sciences alumni
Category:Fellows of the American Academy of Arts and Sciences
Category:Fellows of the American Mathematical Society
Category:MacArthur Fellows
Category:Courant Institute of Mathematical Sciences faculty
Category:Partial differential equation theorists
Category:Jewish American scientists
Category:21st-century Romanian mathematicians
Category:Romanian emigrants to the United States
Category:American people of Romanian-Jewish descent
Category:21st-century American Jews
Category:Tudor Vianu National College of Computer Science alumni
Category:Recipients of the National Order of Merit (Romania)

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Adapted from the Wikipedia article [Sergiu Klainerman](https://en.wikipedia.org/wiki/Sergiu_Klainerman) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Sergiu_Klainerman?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.