Sorin Teodor Popa
Born	(1953-03-24) 24 March 1953 (age 71) Bucharest, Romanian People's Republic
Alma mater	University of Bucharest
Known for	Von Neumann algebras, subfactors, ergodic theory
Awards	Guggenheim Fellow (1995) Ostrowski Prize (2009) Moore Prize (2010)
Scientific career
Fields	Mathematics
Institutions	University of California, Los Angeles
Thesis	Studiul unor clase de subalgebre ale ${\displaystyle C^{*}}$-algebrelor  (1983)
Doctoral advisor	Dan-Virgil Voiculescu
Doctoral students	Adrian Ioana
Website	www.math.ucla.edu/~popa

Sorin Teodor Popa (born 24 March 1953) is a Romanian American mathematician working on operator algebras. He is a professor at the University of California, Los Angeles.^[1]

Popa earned his PhD from the University of Bucharest in 1983 under the supervision of Dan-Virgil Voiculescu, with thesis Studiul unor clase de subalgebre ale ${\displaystyle C^{*}}$-algebrelor.^[1][2] He has advised 15 doctoral students at UCLA, including Adrian Ioana.^[2]

In 1990, Popa was an invited speaker at the International Congress of Mathematicians (ICM) in Kyoto, where he gave a talk on "Subfactors and Classifications in von Neumann algebras". He was a Guggenheim Fellow in 1995.^[3] In 2006, he gave a plenary lecture at the ICM in Madrid on "Deformation and Rigidity for group actions and Von Neumann Algebras".^[4] In 2009, he was awarded the Ostrowski Prize,^[1] and in 2010 the E. H. Moore Prize.^[5] He is one of the inaugural fellows of the American Mathematical Society.^[6] In 2013, he was elected to the American Academy of Arts and Sciences.

• Pimsner, Mihai; Popa, Sorin (1986). "Entropy and index for subfactors". Annales Scientifiques de l'École Normale Supérieure. 19 (1): 57–106. doi:10.24033/asens.1504. MR 0860811.
• Popa, Sorin (1994). "Classification of amenable subfactors of type II". Acta Mathematica. 172 (2): 163–255. doi:10.1007/BF02392646. MR 1278111. S2CID 123256227.
• Popa, Sorin (1995). Classification of subfactors and their endomorphisms. CBMS Regional Conference Series in Mathematics. Vol. 86. Providence, Rhode Island: American Mathematical Society. doi:10.1090/cbms/086. ISBN 978-0-8218-0321-9. MR 1339767.
• Popa, Sorin (2006). "On a class of type II 1 factors with Betti numbers invariants". Annals of Mathematics. 163 (3): 809–899. arXiv:math/0209130. doi:10.4007/annals.2006.163.809. MR 2215135. S2CID 119174749.
• Popa, Sorin (2008). "On the superrigidity of malleable actions with spectral gap". Journal of the American Mathematical Society. 21 (4): 981–1000. arXiv:math/0608429. Bibcode:2008JAMS...21..981P. doi:10.1090/S0894-0347-07-00578-4. MR 2425177. S2CID 1298719.

• Homepage of Sorin Popa at the University of California, Los Angeles
• UCLA – Sorin Popa elected into the American Academy of Arts and Sciences