I contribute to Linux and Debian in many ways. Here is the list of my major contributions:
- Add Device-Tree support to Linux Kernel for a few Buffalo Linkstation NAS devices [0].
- Maintain Debian-Installer image for a few Buffalo Linkstation NAS devices as ARM porter.
- Add GNU/Screen support to Debian-Installer (Since Stretch Alpha 8).
- Maintain shadowsocks-libev and its related packages, which play an important role to flight with censorship in some areas of this planet.
- Maintain a few system level packages such as adjtimex and wide-dhcpv6 [1].

I also attend conferences, in addition to the Tokyo Debian Meetings held monthly.
- DebConf16, in Cape Town. I had a short session on Debian-Installer's GNU/Screen support [2].
- Mini DebConf Japan 2016, in Tokyo. I had a session on Debian-Installer for Buffalo Linkstation NAS [3][4].

[0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=author&q=Roger+Shimizu
[1] https://qa.debian.org/developer.php?login=rosh
[2] https://debconf16.debconf.org/talks/86/
[3] http://miniconf.debian.or.jp/index.en.html
[4] http://miniconf.debian.or.jp/assets/files/Debian%20Installer%20for%20Buffalo%20Linkstation%20NAS.pdf

Accepted Talks:

Make use of Debian to fight with censorship -- alternative way other than tor

I helped shadowsocks-libev, used to fight with censorship in some countries, to enter Debian archive. I’m going to introduce - why it’s necessary, even we already have tor - how to use it - what’s the benefit