Dell Chang has previously worked as a security engineer in the telecommunications and finance industries, specializing in areas such as public key infrastructure, integration and application of information security products, network packet analysis, and threat intelligence research. He has also served as a security instructor for banks, assisting colleagues in enhancing their security awareness throughout the organization.

With a wide range of expertise, Dell Chang excels in introducing cybersecurity-related knowledge in an easy-to-understand manner and helping companies cultivate security personnel. He is currently a professional lecturer for promoting general education and training in information security at Wisdom Information Security Education and Training.