- Professor at Research Institute for Mathematical Sciences (Kyoto), since 2013.
- Editorial Boards:

- Ph.D., Mathematics,
University of Tokyo, March 2000.
- Adviser: Prof. Y. Kawahigashi

- Ph.D., Mathematics,
Texas A&M University, May 2001.
- Advisers: Prof. W.B. Johnson and Prof. G. Pisier

- Guseman Prize in Mathematics (for graduate students, Texas A&M University), 2000.
- ICM Invited Speaker (Operator Algebras and Functional Analysis), Madrid, 2006. (Daily News)
- Operator Algebra Prize of Japan, 2008.
- Spring Prize (for those under 40, Math. Soc. Japan), 2009.
- JSPS Prize (for young researchers, JSPS), 2010.

- C*-algebras and finite-dimensional approximations (in collaboration
with N. P. Brown),

Graduate Studies in Mathematics, 88. American Mathematical Society, 2008, 509 pp.

- Amenable actions and exactness for discrete groups.

C. R. Acad. Sci. Paris Ser. I Math., 330 (2000), 691--695. doi:10.1016/S0764-4442(00)00248-2 - Homogeneity of the pure state space of
a separable
*C**-algebra (in collaboration with Kishimoto and Sakai).

Canad. Math. Bull., 46 (2003), 365--372. doi:10.4153/CMB-2003-038-3 - Solid von Neumann algebras.

Acta Math., 192 (2004), 111--117. doi:10.1007/BF02441087 - Amenable Actions And Applications.

International Congress of Mathematicians, Vol. II, 1563--1580, Eur. Math. Soc., Zürich, 2006. pdf - Weak amenability of hyperbolic groups.

Groups Geom. Dyn., 2 (2008), 271--280. doi:10.4171/GGD/40 - On a class of II_1 factors with at most one Cartan subalgebra
(in collaboration with Popa).

Ann. of Math. (2), 172 (2010), 713--749. doi:10.4007/annals.2010.172.713 - Examples of groups which are not weakly amenable.

Kyoto J. Math., 52 (2012), 333--344. doi:10.1215/21562261-1550985 - Noncommutative real algebraic geometry of Kazhdan's property (T).

J. Inst. Math. Jussieu, to appear. doi:10.1017/S1474748014000309

**An amenable operator algebra which is not a C*-algebra**- Operator Algebras and Operator Theory Seminar, Seoul National University, November 2013.

**Coarse geometry of discrete groups and applications**(2-hour minicourse)- Geometry of Moduli Space of Low Dimensional Manifolds, RIMS, November 2013.

**Noncommutative real algebraic geometry of Kazhdan's property (T)**(Handout.pdf)- Séminaire Géométrie Topologie Dynamique, Orsay, February 2014.
- Séminaire Dynamique Mesurable, ENS Lyon, February 2014.
- Séminaire d'Algèbres d'Opérateurs, Paris 7, March 2014.
- Operator Algebras Seminar, Fields Institute, April 2014.
- Operator Algebra Seminar, University of Tokyo, April 2014.
- Conference on Banach methods in Noncommutative Geometry, Wuhan, June 2014.
- Colloquium, Kyoto University, July 2014.
- Classification, STructure, Amenability and Regularity, University of Glasgow, September 2014.
- von Neumann algebras and ergodic theory, UCLA, September 2014.
- Arithmetic and allied subjects on the banks of the Neva, EIMI, November 2014.

**Approximation Properties for Group C*-Algebras**(4-hour minicourse)- Banach and Operator Algebras over Groups, Fields Institute, April 2014.

**Introduction to Noncommutative Real Algebraic Geometry**(minicourse)- Summer Camp on Operator Algebras, Otaru, July 2014. (6 hours)
- Hyperbolic Geometry and Geometric Group Theory, University of Tokyo, July 2014. (3 hours)

**Elementary amenable groups are quasidiagonal**(Handout.pdf)- Operator Algebras and Applications (ICM Satellite Conference), Cheongpung, August 2014.
- Operator Methods in Harmonic Analysis, Belfast, August 2014.

**The Furstenberg boundary and C*-simplicity**- Kyoto Operator Algebra Seminar, RIMS, October 2014.
- Functional Analysis Seminar, UCLA, February 2015.
- Workshop on C*-algebras: Structure and Classification, WWU Münster, April 2015.
- NCGOA, Vanderbilt University, May 2015.
- Operator Algebra and Harmonic Analysis, TSIMF (Sanya), May 2015.

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