Sieg Mueller is the founder and CEO of Analytical Science & Technologies Group, Inc.

Mueller has over 25 years of experience in the gas industry and is a globally recognised expert in carbon dioxide analytics and process gas control. He was formerly the head of global operations product support for BOC Gases and possesses extensive knowledge of air liquefaction, gas production, and commoditization. He is a patent holder for cryogenic sampling systems, data collection and remote telemetry, and chemical weapon and threat detection.

He served as ISBT President between 2017 and 2018 and is the current treasurer.