Sorin Popa

       UCLA Mathematics Department, Box 951555

       Los Angeles, CA 90095-1555


       B.S., University of Bucharest, 1976; M.S., University of Bucharest, 1977
       Ph.D., University of Bucharest, 1983 (advisor Dan Voiculescu)


        Professor, UCLA Department of Mathematics, 1987-present  (Chair 2009-2012)
        Professor, University of Geneva, 1996-1998
        Principal Researcher, INCREST, 1977-87

Sabbaticals and Visiting Positions

        Visiting Professor Institut de Mathematique de Jussieu, April - December 2023
        Institute Henri Poincare (Paris), program "Groups Acting on Fractals, Hyperbolicity and Self-Similarity", April 10-July 10, 2022.
        MSRI Simons Visiting Professor  March-May 2020
        Visiting Professor RIMS and Kyoto University, April 2019
        Newton Institute in Cambridge, member of the program ``Subfactors'', Spring 2017.       
        Visiting Professor Institut de Mathematique de Jussieu  (under a Chaire FSMP-FMJH) July 2016-June 2017
        Visiting Professor RIMS and Kyoto University, September 2016
        Hausdorff Institute in Bonn, member/organiser of the program ``von Neumann Algebras'', May-July 2016
        Mittag-Leffler Institute, member of the program in ``Classification in Operator Algebras'', April 2016     
        Visiting Professor at CNRS and Institut de Mathematique de Jussieu Paris 6&7, July 2012-September 2013 
        Visiting Professor at Institut Henri Poincare (under a Chaire Blaise Pascal), April-July 2011
        Visiting Professor, College de France and CNRS, 2004-2005
        Mathematical Sciences Research Institute Yearlong Member  2000-2001
        Visiting Professor, University of Paris 6 & 7, 1992, 1995-1996, Summer 2001
        Visiting Professor, E. Schroedinger Institute, Viena, Austria, Summer 1994
        Institut des hautes Etudes Scientifiques Yearlong Member 1991-1992
        Visiting Professor, Institute des Hautes Etudes Scientifiques, June 1989, Spring 1990

Grants 1995-present
NSF-Grant DMS-1955812: Ergodic embeddings, bimodule decomposition, and structure of II$_1$ factors, 2020-2023
        NSF Grant DMS-1700344: Rigidity, L^2-cohomology, and approximate embeddings in II_1 factors, 2017-2020
        NSF Grant DMS-1400208: Approximation, Deformation-Rigidity, and Classification in II_1 Factor Framework, 2014-2017
        NSF Grant DMS-1101718, 2011-2014; NSF Grant DMS-0100883, 2001-2006; NSF Grant DMS-0605456, 2006-2011
        Fond National Suisse Grant, 1996-1998; NSF Grant DMS-9500882, 1995-1998; NSF Grant DMS-9801324, 1998-2001

Honors, special recognition, etc

        Takesaki Endowed Chair in Operator Alegbras 2018-2023
        Simons Participant and Senior Fellow IPAM Program ``Quantitative Linear Algebra'' Spring 2018
        The John von Neumann Lecture, Muenster University, May 4th 2017
        Distinguished Lecture Series College de France, Paris, Nov. 10-24, 2016
        Chaire d'Excellence Fondation des Sciences Mathematiques de Paris (FSMP) and Chaire Mathematique Jacques Hadamard (FMJH), July 2016- June 2017 

        Simons Fellow in Mathematics 2016-2017
        Plenary speaker at the Congress of Scandinavian Math Society, March 20th 2016.

        Coble Lectures  Univ. of Illinois Urbana Champaign Feb 2-4, 2016
        Coxeter Lecture Series, Fields Institute, May 2014

        Takagi Lecture May 2013
        Elected to the American Academy of Arts and Sciences 2013
        Fellow of the American Math Society 2012
        Simons Fellow in Mathematics 2012-2013
        E. H. Moore Research Article Prize  2010 (of the American Math Society)
        Ostrowski Prize 2009
        Chaire Blaise Pascal 2009        
        Plenary Speaker Canadian Mathematical Society Annual Meeting, Ottawa, Dec 2008
        Bourbaki Seminar given by S. Vaes on items [57,64,70,73] of my Publications, June 2007       
        Plenary Speaker International Congress of Mathematics, Madrid, Aug. 2006
        College de France Medal and Special Lecture Series, Nov. 2004
        Plenary Speaker AMS Meeting, Vanderbilt University,  Oct. 2004

        Bourbaki Seminar given by A. Connes on item [58] of my Publications, June 2003
        Invited Address Joint Annual AMS Meeting, San Antonio, Jan. 1999

        Top 250 most cited mathematicians in Thompson Reuters ( 2000
        Guggenheim Fellow, 1995-1996
        CBMS Lecture Series ``Classification of subfactors and related topics", Univ. of Oregon 1993
        Invited Address Section 9 International Congress of Mathematics, Kyoto, Japan , 1990. 

        The Simion Stoilov Prize of the Romanian Academy of Sciences, 1981

Ph.D. Graduates

        Dietmar Bisch (1991) Professor Vanderbilt University
        Florin Radulescu (1991) Professor University of Rome 2
        Florin Boca (1993) Professor University of Illinois at Urbana-Champaign
        Tullio Ceccherini (1994) Professor University of Benevento, Italy
        Mihai Petrescu (1997) Video-Software Company, California.
        Remus Nicoara (2004)  Associate Professor, University of Tennessee Knoxville
        Roman Sasyk (2004) Associate Professor University of Buenos Aires
        Jesse Peterson (2006) Associate Professor Vanderbilt University
        Adrian Ioana (2007) Professor  UCSD
        Ionut Chifan (2009)  Associate Professor, Univ. of Iowa.
        Hiroki Sako (2009; jointly with Yasu Kawahigashi) Associate Professor, Niigata University, Japan
        Adam Winchester (2012) Software Company Los Angeles
        Owen Sizemore (2012) Software Company, Wisconsin Madison
        Brian Leary (2015), Associate Professor at West Virginia University Institute of Technology 
        Alin Galatan (2016) software engineer at Twitter Company
        Adreas Aaserud (2016) Postdoc (Research associate) at University of Cardiff School of Mathematics

Recent Postdocs at UCLA

        Cyril Houdayer, 2007-2009 (Hedrick postdoc)
        Thomas Sinclair, 2011-2014 (RTG-Hedrick postdoc)
        David Penneys, 2014-2016 (UCLA postdoc)
        Brian Leary, 2015-2016 (UCLA adjunct) 
        Yusuke Isono, 2015-2016 (Japan postdoc fellowship at UCLA)
        Daniel Hoff, 2016-2020 (RTG Hedrick, then Adjunct)
        Rolando de Santiago, 2017-2020 (RTG Hedrick, then UC President Fellow) 
        March Boedihardjo, 2016-2020 (Hedrick, then Adjunct)
        Pieter Spaas, 2019-2022 (Hedrick postdoc)
        Srivatsav Kunnawalkam Elyayavalii, 2022-2023 (IPAM/UCLA postdoc)
        Changying Ding, 2023-2026 (Hedrick postdoc)

Recent Professional Service

        Coorganizer (with Dai Evans, Masaki Izumi and Yoshiko Ogata) of the Workshop ``Subfactor Theory'', at Newton Institute, Cambridge,  June 26-30, 2023.
        Coorganizer (with Sri Kunnawalkam-Elyayavalii and Dima Shlyakhtenko) of the Conference ``Modern Trends in Operaor Algebra'', UCLA, March 25-29, 2023.
        Coorganizer (with Dietmar Bisch and Dima Shlyakhtenko) of the Workshop ``von Neumann algebras'',

         Hausdorf Institute for Mathematics (HIM), University of Bonn, August 28th- September 2nd, 2022. 
Coorganizer (with Alice Guionnet, Assaf Naor, Gilles Pisier, Dima Shlyakhtenko, Nikhil Srivastava, Terry Tao) of the Program ``Quantitative Linear Algebra'', 03/19-06/15 2018, IPAM (UCLA)        
Coorganizer (with Damien Gaboriau, Cyril Houdayer and Stefaan Vaes) of the conference ``von Neumann Algebras and Measured Group Theory'', July 3-7, 2017, IHP (Paris)     
Coorganiser (with D. Bisch, V.F.R. Jones and D. Shlyakhtenko) of the Program ``von Neumann Algebras'', Hausdorff Institute in Bonn, May 2 - August 15 2016.
Coorganiser (with Dima Shlyakhtenko) of the UCLA mini-conference ``Ergodic Theory and Logic'', January 15th, 2016.  
Coorganiser (with A. Ioana, J. Peterson, D. Shyakhtenko) of the UCLA Workshop ``von Neumann algebra and Ergodic Theory'', September 2014.
Coorganiser of the Summer School in ``Rigidity and Group Actions'', Paris, June 13-28, 2013.           
Coorganizer of the UCLA Workshop ``von Neumann Algebras and Ergodic Theory'', May 2012, March 2009, March 2007.
Coorganiser (with Damien Gaboriau and Stefaan Vaes)  of  the program Von Neumann algebras and ergodic theory of group actions,  April 18 - July 9, 2011, IHP (Paris).
Coorganizer (with A. Ioana, N. Ozawa, Y. Shalom)  of  the Special Session ``von Neumann Algebras and Ergodic Theory'', AMS Meeting, UCLA Oct 10-12, 2010.
Coorganiser of Spring Institute ``Non-commutative geormetry and Operator Algebras'', Vanderbilt, May 2010.
Coorganizer of  the Oberwolfach Conference in ``von Neumann Algebras and Ergodic Theory'', Oct. 26-30, 2008.
Coorganizer of the Fields Institute Workshop in ``von Neumann Algebras'', Oct 29-Nov 2, 2007.
Coorganizer of the UCLA Workshop ``von Neumann Algebras and Ergodic Theory'', March 2007. 
Coorganizer of the UCLA Conference ``Beyond Amenability: Groups, Actions and Op. Alg. '', May 2006
Coorganizer of the AMS  Section Meeting  ``von Neumann Algebras'', Vanderbilt Univ., October 2004
Coorganizer of the UCLA Conference ``von Neumann Algebras and Ergodic Theory'', May 2003
 Editor: Pacific Journal of Mathematics, 
 Editorial Board: Journal of the American Mathematical Society (2005-2012), Journal of Operator Theory (Editor 1986-1988), Annali dell'Universita di Ferrara,
 Revue Roumaine de Math. Pures et Appl., PanAmerican Mathematical Journal

          Co-Editor of the Clay Math Institute Proceedings ``Non-commutative Geometry'', April 2007 Conference in honour of A. Connes.

          ICM  2010 Panel Section 9 Speaker Committee (Chair) 
 ICM 2018 Program Committee, 2016-2018 (member)
 ICM 2022 Panel Speaker Committee for Section 8 (Analysis), 2020-2022 (member)
 Committee member for the inaugural ``Foias Prize in Operator Theory'' 2021.

Selected Recent Talks                                                                                                                                                           

       Invited talk at the Conference ``Operator Algebras and Mathematical Physics (Yasu's Festa)'', Tokyo University,  July 24-28, 2023.
       Invited talk at the Conference ``Subfactor Theory'', Newton Institute, Cambridge, June 26-30, 2023.
       Invited talk at the Workshop ``Where mathematics Meets Quantum Physics: a workshop on the occasion of Roberto Longo's 70th birthday'',
       Rome, June 21-23, 2023.
       Invited talk at the Conference ``Groups and Operator Algebras'', Inst. of Math. Orsay, June 6-9, 2023. 
       Invited talk at the Conference ``Modern Trends in Operator Algebras'', UCLA, March 25-29, 2023.
       Invited talk at the Workshop ``von Neumann algebras and geometric group theory'', UCSD, Feb. 1012, 2023.
       Invited talk at the Oberwolfach meeting in ''C*-algebras", August 7-13, 2022.    
       Invited talk at the workshop "Operator Algebras: Subfactors, K-theory, Conformal Field Theory" in Gregynog Hal (Wales), July 28-Aug 2, 2022.        
       Invited speaker at the Satellite ICM Converence "Operator Algebras, Dynamics, Groups and Applications", U. of Copenhagen (Denmark), July 1-4, 2022.  
       Invited talk "Operator Algebras and Applications" Conference August 26, 2021, Univ. of Tokyo (Japan).    
       Invited talk "Operator Algebras and Related Fields" Conference June 8-10, 2021, Istanbul Center for Math Sci (Turkey)    
       Invited talk at "Mathematical Picture Harvard Seminar" March 9, 2021, Harvard Univ.    
       Invited talk Oberwolfach Conference  ``Groups, Dynamics, and Approximation'', Dec 2-7, 2019   
Invited speaker ``Memorial Conference for Dick Kadison'', Copenhagen Univ., Nov 29-30, 2019   
Invited speaker Banff  Workshop ``Classification problems in vN algebras'', Oct 1-4, 2019  
Invited talk Oberwolfach Conference ``C*-algebras'', August 12-18, 2019
       Invited talk GPOTS, May 28-June 1 2019
        Colloquium talk Kyoto University April 24, 2019
        KTGU Lecture Series RIMS and Kyoto University, April 8-12, 2019
        Invited talks at the Workshops of the Program ``Quantitative Linear Algebra'', March-May, 2018.
        Invited talk at the AIM Conference on ``Classification of group von Neumann algebras'', Jan 29-Feb 2, 2018
        Invited talk, Conference "Non-commutative geometry" in honor of A. Connes 70th birthday, Fudan Univ. Shanghai, 03/28-04/02 2017
        Invited talk at the workshop ``Subfactors'', Newton Institute, Cambridge, UK, January 22-27, 2017
        Colloquium talks at Bordeaux University (October 2016) and Univ. of South Paris (March 2017).

        Invited talk at the Conference``Recent progress in Operator Algebra'', Kyoto University, Sept. 9-12, 2016.
        KTGU Lecture Series RIMS and Kyoto University, Sept. 5-9, 2016

        Invited talk at the Oberwolfach Conference in ``C*-Algebras'', August 21-27, 2016.
        Series of talks at the ``Operator Algebras and Mathematical Physics'' Conference in Sendai (Japan), August 1-14, 2016
        Invited Speaker at the CMTP Conference Operator Algebras and Conformal Field Theory in Rome June 27-29, 2016
        Invited Speaker at the ``Haagerup Symposium'', Coopenhagen June 24-26, 2016
        Invited Speaker NCGOA Conference at Hausdorff Institute May 17-25, 2016
        Talk at the Mittag-Leffler Institute April 2016
        Invited Speaker ``Non-commutative Geometry'' Conference for G. Skandalis' 60th, CIRM (Luminy), November 2015.
        Invited Speaker ``East Coast Operator Algebra Conference'', U. of Iowa, Oct 2015.
        Invited talk at Oberwolfach Conference in ``Non-commutative Geometry'', June 2015.
        Invited speaker ``Great Plains Operator Theory'' Conf. Purdue University, May 2015.
        Mini Course at the Spring Institute Non-Commutative Geometry and operator Algebras, Vanderbilt Univ. May 2015 
        Series of talks at the Operator Algebra Conference, Te Anau, New Zealand, January 2014
        Colloquium talk UCLA October 2013       
        Series of talks at the Summer School in ``Rigidity and Group Actions'', Paris, June 13-28, 2013   
        Invited speaker ``Mathematics and quantum physics'', Academia dei Lincei, Rome, July 8-12, 2013
        Invited Speaker ``von Neumann algebras and measurable group theory'', Leuven University, July 1-4, 2013.
        Invited Speaker ``Math Physics and Operator Algebra'', University of Milano, December 2012.
        Invited Speaker ``10 years anniversary of Journal of Inst Math Jussieu'', November 2012.
        Invited Speaker ``Interactions Between Ergodic Theory, Number Theory and Noncommutative Geometry'' Conference at Ohio State University, May 2012.
        Colloquium Lecture UC San Diego, April 2012.        
        Invited speaker ``von Neumann Algebras and Related Topics'' conference at RIMS (Kyoto, Japan), Jan 2012.
        Chaire Blaise Pascal Closing Conference, Institut Math Jussieu, Oct 2011       
        Colloquium Lecture University of Rome II (Italy), June 2011 
        Lecture Series at the Program von Neumann Algebras and  Ergodic Theory of Group Actions,  Institut Henri Poincare May 2011
        Mini Course at the Spring Institute Non-Commutative Geometry and operator Algebras, Vanderbilt Univ. May 2010 
        Invited Speaker  ``Operator Algebras Conference in Honor of Uffe Haagerup's 60the birthday'', Coopenhagen April 2010.
        Colloquium Lecture  Basel Universit, March 2010.
        Invited Speaker SUMIRFAS Conference, Texas A&M, Aug. 2009.
        Invited Speaker ``Non-commutative Geometry'' Coference in Honor 
                of Ricu Moscovici 65th Birthday, Max Planck Institute, Bonn, July 2009.
        Main Speaker  ``East Coast Operator Algebra'' meeting, Penn State, Oct 2008.
        Invited Speaker ``Operator Algebras'', Oberwolfach Aug 2008.
        Invited Speaker ``Geometry, Rigidity and Group Actions'', Conference in Honor
               of Bob Zimmer 60'th Bithday, Sept. 6-9, 2007, University of Chicago.
        Invited Speaker ``von Neumann Algebras and Non-Commutative Geometry'', Coference
               in Honor of Alain Connes 60'th Bithday, April  2-6, 2007, Inst Henri Poincare (Paris)
        Invited Speaker ``Groupoids in Oper. Alg. and Noncommut. Geometry'' Conference,
               Institut Henri Poincare (Paris), February 2007.
        Invited Speaker  ``US-Japan Conference in Operator Algebras'', University of Hawai, January 2007.
        Colloquium Lecture Vanderbilt University, Nov. 2006.
        Invited Speaker  ``von Neumann algebras''  BIRS Center, Banff (Canada) Sept. 2006.
        Invited Speaker  ``Logic and Mathematics'' University of Illinois Urbana Champaign, June 9-11, 2006.
        Colloquium lectures University of Michigan and University of Illinois Urbana-Champaign, Feb. 2006
        Invited Speaker  ``Geom. and prob. methods in group theory  and dyn. sys.''  Texas A&M Nov. 2005.
        Main Speaker ``East Coast Operator Algebra'' Conference, University of Philadelphia, October 2005.
        Colloquium Lecture University of Rome 2, Tor Vergata, September 2005.  
        Invited Speaker ``Operator Algebra'' Conference, Oberwolfach (Germany), August 2005.
        Invited Lecture ``Group actions, rigidity and dynamics'', Banff (Canada) July  2005. 
        Minicourse Lecturer, ``Spring Institute on Noncommutative Geometry'', Vanderbilt Univ., May 2005
        Main Speaker, ``Geometric Group Theory and Harmonic Analysis'', Cortona, June 2004
        Colloquium Lecture University of California Riverside, April 2004.
        Main Speaker, School in ``von Neumann Algebras'', Marseille, February 2004
        Main Speaker: ``Group Theory'', Gaeta (Italy), June 2003

Research interests

Curriculum Vita




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