- 30th Canadian Conference on Computational Geometry (CCCG) August 8–10, 2018 (Program committee member)
- Second Workshop on Mathematical Logic and its Applications March 5–9, 2018 (Invited speaker)
- IEICE Transactions A: Special Section on Discrete Mathematics and Its Applications September 2018 (projected) (Editorial committee member)
- Twentieth Korea-Japan Joint Workshop on Algorithms and Computation (WAAC) August 25–26, 2017 (Program committee member)
- Summer School on Foundation of Mathematics (Organizer and Lecturer) August 5–7, 2017
- A short course on Computation Theory and Analysis (In Japanese) Department of Mathematiccs, Kyushu University, July 10–14, 2017 (Lecturer)
- Whole Brain Architecture Initiative (WBAI) Seminar May 2017 (Invited speaker)

- Computability and Complexity in Analysis (CCA) (Steering committee member)
- Logic and History Section, Mathematical Society of Japan (In Japanese) (Committee member)
- IEICE-COMP: Theoretical Foundation of Computing (In Japanese) (Technical committee member)

- Mathematical Society of Japan (MSJ) Spring Meeting March 2017 (Invited speaker)
- Joho Shori (Magazine of the Information Processing Society of Japan) (In Japanese) (Editorial board member, 2015–17)
- K. Yamaguchi, Eds.,
*Jôhô*(Introduction to Informatics), University of Tokyo Press, March 2017 (Chapter 6) - 28th Symposium of the Research Association of Mathematical Programming (RAMP) October 13–14, 2016 (Invited speaker)
- Nineteenth Japan-Korea Joint Workshop on Algorithms and Computation (WAAC) August 30–31, 2016 (Program committee member, Organizing chair)
- Thirteenth International Conference on Computability and Complexity in Analysis (CCA) June 15–17, 2016 (Program chair)
- IEICE Transactions A: Special Section on Discrete Mathematics and Its Applications June 2016 (Editorial committee member)
- Open Problem Seminar (April 1–2, 2016) (Organizer)
- 78th Convention of IPSJ, special section (In Japanese) March 2016 (Invited speaker)
- Sixth International Conference on Mathematical Aspects of Computer and Information Sciences (MACIS 2015) Special Session “Real Complexity: Theory and Practice” November 11–13, 2015 (Co-organizer)
- Dagstuhl Seminar: Measuring the Complexity of Computational Content: Weihrauch Reducibility and Reverse Analysis September 20–25, 2015 (Co-organizer)
- Twelfth International Conference on Computability and Complexity in Analysis (CCA) July 12–15, 2015 (Organizing chair)
- Sixteenth International Workshop on Logic and Computational Complexity (LCC) July 4–5, 2015 (Invited speaker)
- 31st International Symposium on Computational Geometry (SoCG) June 25–28, 2015 (Program committee member)
- IEICE Transactions A: Special Section on Discrete Mathematics and Its Applications June 2015 (Editorial committee member)
- IPSJ SIGAL & JSAI SIG-FPAI Joint Workshop January 13–14, 2015 (Invited speaker)
- 26th Canadian Conference on Computational Geometry (CCCG) August 11–13, 2014 (Program committee member)
- UTokyo Open Campus (In Japanese) August 7–8, 2014 (Organizing committee member)
- Japanese-Swiss Workshop on Combinatorics and Computational Geometry June 4–6, 2014 (Organizing committee member)
- IEICE Theoretical Foundations of Computing (COMP) (Secretary, May 2012–June 2014)
- IEICE Transactions A: Special Section on Discrete Mathematics and Its Applications (June 2014) (Editorial committee member)
- Fifth Workshop on Developments in Implicit Computational Complexity (DICE 2014) April 5–6, 2014 (Invited speaker)
- Computability Theory and Foundations of Mathematics (CTFM) February 17–20, 2014 (Invited speaker)
- A short course on Randomness and Complexity (In Japanese) Kyoto University, December 2–6, 2013 (Lecturer)
- Science Cafe at Tokyo Institute of Technology (In Japanese) November 12, 2013 (Host)
- NII Shonan Meeting on "Implicit Computational Complexity and Applications" November 4–7, 2013 (Co-organizer)
- Fall School on Computatoinal Complexity (In Japanese) September 24–26, 2013 (Lecturer)
- 25th Canadian Conference on Computational Geometry (CCCG) August 7–10, 2013 (Program committee member)
- A short course on Computational Complexity in Analysis (In Japanese) RIMS, Kyoto, July 22–23 and Aug 1–2, 2013 (Lecturer)
- Tenth International Conference on Computability and Complexity in Analysis (CCA) July 8–11, 2013 (Program committee member)
- Computability in Europe (CiE) July 1–5, 2013 (Special session organizer)
- IEICE Transactions A: Special Section on Discrete Mathematics and Its Applications (June 2013) (Editorial committee member)
- ELC Workshop on Randomness and Probability Through Computability May 14–15, 2013 (Co-organizer)
- ELC Tokyo Complexity Workshop March 14–17, 2013 (Organizing committee member)
- ELC Seminar (Group A01: Mathematical Logic) on February 21 (Organizer)
- Open Problem Seminar (September 18–19, 2012) (Organizer)
- Tokyo DMTCS Seminars (Co-organizer)
- ETH-Japan Workshop on Science and Computing (March 2012) (Program committee member)