Seunghun Han has in the past worked at Samsung Electronics as an engineer developing firmware for SD-memory cards, embedded MMC devices, and an automated testing framework which finds faults in firmware. He now works with the National Security Research Institute of South Korea as a security researcher developing anti-malware technologies and investigating software vulnerabilities. He spends his leisure time working on his hobby OS and is the author of the book series titled “64-bit multi-core OS principles and structure, Vol.1 and Vol.2”