Chris Passmore is a certified health physicist with over 34 y of experience in dosimetry and a former lead U.S. Department of Energy Laboratory Accreditation Program (DOELAP) assessor and a current National Voluntary Laboratory Accreditation Program (NVLAP) for NIST in ionizing radiation dosimetry. He is the President for Radiation Detection Company and still provides dosimetry consulting services through Passmore Dosimetry. Prior to consulting and joining RDC, Mr. Passmore worked 21 y at Landauer and 10 y in the DOE nuclear weapons complex managing external and internal dosimetry programs at Rocky Flats and Pantex. Mr. Passmore is an internationally known expert in dosimetry, radiation monitoring, radiation field characterization, regulatory compliance, and accreditation programs. In addition, he has 12 y of experience in serving as a Head of the Approved Dosimetry Services in Canada, United Kingdom, and Ireland. Mr. Passmore serves as a U.S. delegate and technical expert to the International Electrotechnical Commission (IEC) TC45 and International Organization for Standardization (ISO) TC85, where he has been involved in influencing and developing several critical dosimetry standards (IEC 62387, ISO 21099, ISO 15690, ISO 15382, and ISO 14146). In addition to international standard committees, he also serves as a member of the Health Physics Society Standard Committee and a former member of the NCRP. Mr. Passmore holds an MS degree in Health Physics from National Technological University, a BS in Nuclear Engineering from Arizona State University, and a BS degree in both Physics and Engineering from Illinois College.