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ACNW&M MembershipThe ACNW&M membership is composed of five individuals with a wide variety of scientific expertise. The membership currently includes individuals with expertise in geosciences, radioactive waste treatment, environmental engineering, and health physics. Consultants are engaged to provide technical assistance on specific issues when required. ACNW&M members are appointed for four-year terms and normally serve no more than two terms. Committee MembersSelect one of the following names for biographical information about that member. Michael T. Ryan, Chairman See also the Committee Membership Lists Since 1988.
James H. ClarkeDr. James H. Clarke earned his Ph.D. degree in Theoretical Chemistry in 1973 from The Johns Hopkins University in Baltimore, Maryland. In 1967 he earned his B.A. degree in Chemistry with honors from Rockford College, Rockford, Illinois. Dr. Clarke is currently a Professor of the Practice of Civil and Environmental Engineering and the Director of Graduate Studies for Environmental Engineering at Vanderbilt University. His expertise and experience are in environmental fate and transport of chemicals and radionuclides in the environment, risk assessment, hazardous and radioactive waste management and the investigation and remediation of contaminated sites. He is actively engaged in research focused on the long-term management of legacy hazardous and radioactive waste sites and the application of risk assessment to decision-making at contaminated sites. He has provided assistance and independent peer review to the Department of Energy and the NRC in the investigation and remediation of subsurface contamination, risk-informed approaches to contaminated site remediation, and the management of high level, hazardous, and mixed waste. Dr. Clarke has over 30 years of professional experience with approximately 100 publications and presentations. He is a member of the American Nuclear Society, the American Academy of Forensic Sciences, the International Society of Environmental Forensics, and the Society for Risk Analysis.
Allen G. Croff, Vice ChairmanMr. Croff earned his BS degree in Chemical Engineering from Michigan State University in 1971, a Nuclear Engineer Degree from Massachusetts Institute of Technology in 1974, and a MBA from the University of Tennessee in 1981. From 1974 through 2003, Mr. Croff was employed by the Oak Ridge National Laboratory (ORNL) in staff, line management, and program management positions concerning waste management research and development (R&D), analysis of nuclear fuel cycles and nuclear materials management, strategic planning, and program initiation. He has extensive external involvements with U.S. and international technical review, oversight, and integration committees. In addition, his professional experience includes the creation of the ORIGEN2 computer code used world-wide to calculate radionuclide buildup and decay, and its application to nuclear material and waste characterization, risk analysis, and nuclear fuel cycle analysis. Mr. Croff developed and evaluated comprehensive, risk-based waste classification systems, culminating in chairing a committee of the National Council on Radiation Protection and Measurements that issued comprehensive recommendations on this subject. He has led and participated in multi-disciplinary national and international technical and review committees such as the National Academy of Sciences, the National Council on Radiation Protection and Management, the Nuclear Energy Research Advisory Committee, and the Nuclear Development Committee of the Nuclear Energy Agency. 
William J. HinzeDr. William J. Hinze received the B.S. degree in Geology and physics in 1951 from the University of Wisconsin and after serving in the U.S. Army at the Engineer Research and Development Laboratory and employment in industry he returned to the University of Wisconsin to complete the Ph.D. degree in Geophysics in 1957. Dr. Hinze is currently a Professor Emeritus at Purdue University. He spent 40 years developing solid-earth geophysics programs and teaching at Michigan State and Purdue Universities where he was graduate advisor to roughly 100 M.S. and Ph.D. students. Research support by the NSF, DOE, NRC, NASA, U.S. Army, ONR and a variety of private industrial and research organizations have been a prominent part of Dr. Hinze’s academic activities. He has had a major role in developing and applying geophysical techniques, particularly geopotential methods, to the exploration of the continental crust. His work has involved scales, varying from the geophysical investigation of waste landfill sites to satellite investigations of regional crustal structures. His geophysical studies of the North American continent have led to a number of prominent discoveries. Special recognition has been given to his work on rifts and the seismotectonics of the continental interior. He has had a leading role in developing and analyzing large digital geophysical data sets. He has published over 125 scientific papers, co-edited three monographs and co-authored a book. Dr. Hinze has been a member of three NAS/NRC committees and numerous task groups of the Academy and a member or chair of several committees of the international professional societies. He has served in an advisory capacity to the NASA, USGS, DOE, US AID, NRC, and a number of major engineering, mining, and petroleum organizations. He has been active in the professional, technical, and editorial affairs of American Geophysical Union, the Society of Exploration Geophysicists, and the Geological Society of America. He is a Fellow of the latter organization and has served as chairman of its Geophysical Division. In addition, he served as Senior Editor of the Journal of Geophysical Research-Solid Earth from 1991-1996, a member of the U.S. Nuclear Regulatory Commission’s Advisory Committee on Nuclear Waste and Materials from 1989 to 1997, and chairman of the Board of Journal Editors of the American Geophysical Union from 2000 to 2002.
Michael T. Ryan, ChairmanMichael T. Ryan, Ph. D., C.H.P. is an independent consultant in radiological sciences and health physics. He is certified in comprehensive practice by the American Board of Health Physics. He is an adjunct faculty member at Texas A & M University and Vanderbilt University. Dr. Ryan received the Ph.D. in 1982 from the Georgia Institute of Technology, where he was inducted into the Academy of Distinguished Alumni. He graduated From Lowell Tech with a Bachelor’s in Radiological Health Physics and a Master’s In Radiological Sciences and Protection from the University of Lowell. Dr. Ryan was the 1998 recipient of the Francis Cabot Lowell Distinguished Alumni Award for Arts and Sciences from UMass Lowell. Dr. Ryan is the Editor-in-Chief of the Journal Health Physics and has served in this position since 2000. He previously served as Chairman of the External Advisory Board for Radiation Protection at Sandia National Laboratories from 1999-2007. Dr. Ryan has been a member of the National Council on Radiation Protection and Measurements since 1992. He was elected to the Board of Directors and served from April 1998 to May of 1992. He was appointed as Chairman of Scientific Committee 87 and Scientific Vice President for the Program Area of Radioactive and Mixed Waste from April 1998 to May 2002. He had previously served on the Faculty of the College of Health Professions at the Medical University of South Carolina. Dr. Ryan, appointed in 2002 and reappointed in 2006, serves on the Advisory Committee on Nuclear Waste for the Nuclear Regulatory Commission and currently serves as Chairman. He also served nine years, four as Chair, on the Scientific Review Group appointed by the Assistant Secretary of Energy to review the ongoing research in health effects at the former weapons complex sites in the Southern Urals. He has also served on several Committees of the National Academy of Sciences. Dr. Ryan previously worked for Chem-Nuclear Systems, Inc., as Vice President and General Manager for the operations and compliance of the low-level radioactive waste disposal and service facilities in Barnwell, South Carolina. Previously, Dr. Ryan spent seven years in operational and environmental health physics at Oak Ridge National Laboratory.
Ruth F. WeinerDr. Ruth F. Weiner earned her B.S. and M.S. degrees in physics in1956 and 1957 from the University of Illinois, and a Ph.D. degree in chemistry from the Johns Hopkins University in 1962. Dr. Weiner is a Principal Member of the technical staff at Sandia National Laboratories. She is responsible for the RADTRAN and related risk analyses for the YMEIS. Dr. Weiner returned to Sandia as the principal investigator for the RADTRAN transportation risk assessment program and redesign of the RADTRAN code. Before coming to Sandia, Dr. Weiner was Dean and Professor of Environmental Studies at Western Washington University, Associate Professor and Chair of the Department of Chemistry at Florida International University, and Assistant Professor of Chemistry at Colorado Women's College. She is currently an adjunct professor in the Nuclear Engineering and Radiation Sciences Department of the University of Michigan. Dr. Weiner has overseen risk assessments including transportation of NORM and NARM to the Hanford low-level waste site, environmental assessment of transportation of uranium hexafluoride, alternate routes to the WIPP sites, and risks from incinerators of various types. Other projects include actinide chemistry of WIPP waste, decision-aiding analysis for disposition of EBR-II waste and Savannah River actinide waste, environmental impacts of oil port siting and LNG port siting, and analyses of pollutant dispersion from a variety of emission sources. Dr. Weiner is author of more than 100 technical publications and is a co-author of two textbook series: Environmental Engineering and Environmental Pollution and Control (Butterworth-Heinemann). She has served on the Board of Directors of the American Nuclear Society, and is currently Secretary-Treasurer of the Society's Fuel Cycle and Waste Management Division, and Scholarship Chair for the Society's Environmental Sciences Division, She currently serves on the Board of Directors of the National Atomic Museum.
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