Mr. Jyan is the Director General of Department of Cyber Security, Executive Yuan.  His experience and professional specialty mainly includes parallel and distributed computing, algorithms, object-oriented design, information security, and project management.  He is in charge of cyber security policy making of the government.  

Mr. Jyan has been working for different agencies before joined Executive Yuan, including Director General of Department of Information Management, National Development Council (NDC)., Deputy Director of Research, Development, and Evaluation Commission(RDEC), section chief of Overseas Compatriot Affairs Commission (OCAC), Taiwan; technical specialist of Central Weather Bureau (CWB), Ministry of Transportation and Communications (MOTC), and private sectors.

He is also an assessor of information security management system, and holds certificates for ISMS LA (Information Security Management System Leading Auditor), CISSP (Certified Information Systems Security Professional), CEH (Certified Ethical Hacker), and CISM (Certified Information Security Manager). He holds M.S. degree in Computer Science and Information Management from National Chung Cheng University.