Running an accredited laboratory, testing valves for leakages has long been part and parcel of Zeger’s day-to-day activities. However, his professional interest in fugitive emissions extends far beyond generating reliable data; he is passionate about identifying the root causes of leaks and contributing to effective solutions. He also allocates significant time to the development of standards, such as the recently issued ISO 12101. Fugitive Emissions Journal spoke to Zegers about his work, motivation, and determination to bring ISO 12101 from idea to reality.