executive committee chairperson, organizer, and challenge creator of the SECCON CTF contests that are held several times a year throughout Japan including large international online and in-person contests. OWASP Japan advisory board, the review board for the lCODE BLUE conference, a Microsoft MVP of Developer Security, the leader of the Shibuya Perl Mongers group, and has been designated an expert in ISO/IEC JTC 1/SC 22 programming languages such as C# and other scripting languages. He has also presented at information security conferences such as HITCON in 2011 "Disassembling Flash Lite 3.0 SWF Files"​, and OWASP AppSec APAC 2014 "Secure escaping method for the age of HTML5"​, and has published some books and papers: "Reading ECMA-262 Edition 5.1"​ and "How to Execute Arbitrary Code on x86 JIT Compliers" etc.