John Jackson is a senior penetration tester and is the founder of Sakura Samurai 桜の侍, a hacking group dedicated to legal hacking.

He is most known for multiple CVE and enterprise security research contributions. Jackson currently resides in Denver, Colorado. He spends much of his time hacking, but also enjoys reading, writing, and making music.

Jackson has contributed to the threat and vulnerability space, disclosing several pieces of cyber vulnerability research and assisting in resolution for the greater good. He continues to work on several projects and collaborates with other researchers to identify major cyber vulnerabilities.