Biographies of Representatives and Alternates

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United States of America


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Vincent Holahan

Dr. E. Vincent Holahan is a Senior Level Technical Advisor for Health Physics within the Office of Nuclear Material Safety and Safeguards at the U.S. Nuclear Regulatory Commission (NRC).

Dr. Holahan received a Bachelor of Arts degree in chemistry and a Bachelor of Sciences degree in biology from Gonzaga University. He received a doctoral degree in Radiology and Radiation Biology and an interdisciplinary degree in Cellular and Molecular Biology from Colorado State University, USA. He also completed a one-year postdoctoral fellowship in the Department of Radiation Oncology, University of California, San Francisco.

At the NRC, Dr. Holahan is responsible for developing technical standards for issuing federal regulations and guidance to limit occupational and public exposure to ionizing radiation. Before joining the NRC in 1996, he was a senior program officer with the U.S. National Academies of Science. Dr. Holahan completed 35 years of active and reserve service in the U.S. Army as nuclear medical sciences officer.

Dr. Holahan was a member of the U.S. National Economic Council panel that reviewed the occupational hazards associated with nuclear weapon production by the Department of Energy; a former U.S. representative to the International Atomic Energy Agency (IAEA) steering group on occupational radiation protection, the former NRC representative to the Nuclear Energy Agency (NEA) Committee on Radiation Protection and Public Health, a former Vice Chairperson of the NEA/IAEA Information Systems on Occupational Exposure, and is a Council member on the National Council on Radiation Protection and Measurements.

Dr. Holahan joined the United States delegation to UNSCEAR in 2000, served as alternate representative for the sixty-second session in 2015, and as representative since the sixty-fourth session in 2017.

Alternate Representative

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Armin Ansari

Dr. Armin Ansari is the Radiological Assessment Team Lead at the U.S. Centers for Disease Control and Prevention (CDC). He received his undergraduate and doctoral degrees in radiation biophysics from the University of Kansas, and conducted his postdoctoral research and training in radiation-induced mutagenesis at Oak Ridge and Los Alamos National Laboratories. He was a senior scientist with a radiological consulting firm before joining CDC in 2002.

Dr. Ansari has led the development of key national guidance documents including guides for population monitoring and operation of public shelters after radiation emergencies and has developed training products for public health professionals. He also led the development and audience testing of radiation risk communication products including the CDC Radiation Hazard Scale.

Dr. Ansari is an elected member of the National Council on Radiation Protection & Measurements (NCRP) and serves as its Scientific Vice President for Nuclear and Radiological Security and Safety. He is president emeritus of the U.S. Health Physics Society and an adjunct associate professor of nuclear and radiological engineering at Georgia Institute of Technology.

He has served as member of the United States delegation to UNSCEAR since 2014 and as alternate representative since 2016.