Chia-Hsin Yen, Ph.D., P.E., LL.M., is a licensed professional environmental engineer with experience spanning environmental science, semiconductor fab practice, environmental regulation, technology law, and applied research.
His professional foundation began in environmental science at Tunghai University. Early in his career, he worked with industrial water and wastewater treatment systems at Winbond Electronics. He later joined the Science-Based Industrial Park Administration (SIPA), where his work involved environmental administration, regulatory affairs, factory inspections, and environmental impact assessment within Taiwan’s high-technology industrial sector.
Yen later joined Taiwan Semiconductor Manufacturing Company (TSMC), where he worked on new-fab planning, design and construction, environmental, safety and health management, and emergency response. These experiences provided a practical basis for considering environmental issues in relation to engineering feasibility, plant operation, regulatory requirements, and risk management rather than from a single disciplinary perspective.
After establishing Jason Environmental Professional Office (Jason EP), he continued professional environmental engineering practice while further developing his legal training. He earned an LL.M. in Technology Law from National Chiao Tung University, where his research examined legal responsibility associated with misrepresentation in environmental impact assessment reports. This training complemented his engineering background by providing additional perspectives on evidence, regulatory obligations, and the legal context of technical and professional judgment.
He later pursued academic research to further examine microscopic chemical phenomena and reaction mechanisms, strengthening the scientific basis for understanding and addressing emerging contaminants. He completed a Ph.D. in Environmental Engineering at National Yang Ming Chiao Tung University in 2024. His doctoral research examined the decomposition of perfluorooctanoic acid (PFOA) in water using iron–aluminum composite materials and the role of dimethyl sulfoxide (DMSO). His research interests include PFAS and other emerging contaminants, interfacial reaction mechanisms, water treatment, material transformation, and resource recovery.
Across these stages, his professional development has progressed from environmental science to semiconductor fab practice, from environmental regulation to technology law, and from doctoral research toward independent professional judgment.
Today, through Jason EP, Yen integrates scientific research, engineering practice, regulatory experience, and legal training in environmental work related to high-technology industries. His areas of interest include industrial water and wastewater management, emerging contaminant management, environmental permitting and regulatory practice, circular economy and resource recovery, and the application of research findings to engineering practice.
His professional approach emphasizes the relationship between evidence and implementation. Scientific findings are considered in the context of actual industrial systems, while engineering recommendations are evaluated with regard to technical feasibility, operational conditions, regulatory requirements, and available evidence.
The aim is to provide independent, evidence-based, verifiable, and implementable professional judgment.