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This is the English version. Here is the Japanese version.

Assistant Professor at Mathematical Institute, Tohoku University.

(This picture was taken by my friend Yoh Tanimoto, at Colosseo, Rome in September, 2010.)

- I am going to present a special talk in the Geometry section in the MSJ (the Mathematical Society of Japan) Autumn Meeting 2015. The topic of my talk will be on and around preprint [3].(26/Jun/2015)
- I am invited as a plenary speaker to the confernce "Geometry on Groups and Spaces", which is a satellite conference of ICM 2014; and I have presented a plenary talk. (7/Apr/2014; 10/Aug/2014)
- I visited the University of Neuchatel from 17, April, 2012 to 11, September, 2012 to work with Professor Alain Valette. (10/Mar/2012; 1/May/2012; 12/Sep/2012)
- In December 2011, I gave an introductory mini-course (3 lectures) on Kazhdan's property (T) at the conference "Analysis and Geometry of Discrete Groups and Hyperbolic Spaces" at RIMS(Research Institute for Mathematical Sciences, Kyoto University). This mini-course treats basics on property (T); and my recent result (on preprint [4] in the "List of Papers"). (20/Dec/2011)
- In March, 2011, I finished my Ph.D course at the University of Tokyo, Graduate School pf Mathematical Sciences (Ph.D advisor: Taka Ozawa). From 1. April, 2011 to 30, Apr, 2012, I was a JSPS postdoctral fellow there (postdoc advisor: Masahiko Kanai). (1/Apr/2011; 1/May/2012)
- I contributed a talk in the conference "Workshop on Geometric Group Theory in Goa, India", which was a satellite event to ICM 2010, in August, 2010. (9/Aug/2010; 18/Jul/2010)
- I have finished my long stay at EPFL (Switzerland, Lausanne) for the period 15 February 2010-- 11 January, 2011, with the financial support by JSPS (Japan Society for the Promotion of Science). The purpose of this stay is an entrustment of the guidance of my study to Professor Nicolas Monod. (11/Jan/2011; 15/Feb/2010; 10/Jan/2010)
- Professor Danny Calegari wrote a commentary at his research blog on my talk in the conference "New Directions in Geometric Group Theory", which was held at the University of Queensland (Australia, Brisbane) during 14 December-18 December, 2009. (10/Jan /2010)

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