Jianjun Chen is a Postdoc Researcher at International Computer Science Institute (ICSI), an independent non-profit research institute affiliated with the University of California, Berkeley. His research focuses on studying real-world systems to understand their security challenges, such as security issues in CDN, HTTP implementations, web browsers, and email systems. His previous research has been recognized by the top-tier academic security conferences (e.g., NDSS, ACM CCS, USENIX Security) and led to some real-world security pushes, such as patches in popular HTTP implementations (e.g., Squid, Chrome, Firefox ), security advisories by industrial companies (e.g., Akamai, Cloudflare, Apple), web standard change, and a new IETF RFC (RFC 8586).