I am currently a Ritt Assistant Professor at Columbia University.

During the 2020-2021 academic year, I will be on leave from Columbia to participate in the Special Year on Geometric and Modular Representation Theory at the Institute for Advanced Study.

I work in representation theory, with a focus on geometric and diagrammatic techniques. In Spring 2018, I was a Strauch postdoctoral fellow in the MSRI program "Group Representation Theory and Applications". I completed my PhD in 2017 at Stanford University under the supervision of Zhiwei Yun.

### Teaching (current courses)

- '20 Spring: Number Theory and Cryptography (Math UN3020)

### Some past activities

- During July 23-27, 2018, Simon Riche and I each gave five hour-long lectures for Summer School "Geometric, Algebraic and Combinatorial Methods in Modular Representation Theory" at FRIAS / University of Freiburg. The subject was the proof of the character formula for tilting modules of reductive groups (completed in our paper joint with Pramod Achar and Geordie Williamson). Notes for my lectures: 1, 2, 3, 4, 5.

(My collaborators also organized an Oberwolfach Seminar in Novembe 2018 and the Dacha seminar in July 2019 on this material. Full notes for all 24(!!) talks are available for the latter.) - In June 26 - July 7, 2017, I helped Ben Elias and Geordie Williamson run a two-week MSRI Summer Graduate School on Soergel Bimodules (videos available). Together with Ulrich Thiel, we expanded the contents of this workshop into a book: Introduction to Soergel bimodules, RSME Springer series vol. 5, 2020 (xxv+590 pages).

### Stuffs

Because this seems to confuse many people, including some of my collaborators: "Makisumi" is my last name. I usually go by "Macky," an anglicization of my Japanese nickname "Makkī" (マッキー), which comes from the first part of my last name.

I did my undergraduate studies in math at Princeton University. Even earlier, in high school, I went to the Canada/USA Mathcamp summer program. It's awesome.