member of the American Industrial Hygiene Association, Mr. Bruce received electrical engineering and S.M. degrees from the Massachusetts Institute of Technology in 1966 and a B.S.E.E. from Lamar State College of Technology in Beaumont, Texas, in 1963.


Beth A. Cooper, an internal hearing-conservation consultant to the National Aeronautics and Space Administration Office of the Chief Health and Medical Officer, provides support for the agency’s occupational health and engineering communities and manages the development, promotion, and public distribution of multimedia training resources for hearing conservationists and noise control professionals. From 1999 to 2007, as manager of the Glenn Research Center Acoustical Testing Laboratory (ATL), Ms. Cooper provided noise control design, testing, and training support for science experiment payloads for the International Space Station. She managed the conceptual design, construction, accreditation, and operations of ATL, the only laboratory accredited by the National Voluntary Laboratory Accreditation Program of the U.S. Department of Commerce for sound pressure level determinations in accordance with ISO 11201. Ms. Cooper has served as director of communication of the National Hearing Conservation Association and is a member of the ANSI S12 Accredited Standards Committee on Noise and Working Group #11 on Hearing Protector Attenuation. She has been a member of the the Institute of Noise Control Engineering of the USA (INCE/USA) Board of Directors, vice president for board certification, and general chair of NOISE-CON 2003. She frequently speaks at workshops and seminars on hearing conservation, with a special focus on multimedia presentation techniques and tools for hearing conservation training. She has a B.S. in mechanical engineering from the University of Hartford and an M.S. in acoustics from the Pennsylvania State University.


Patricia Davies received her B.Sc. in mathematics from the University of Bristol in 1977 and her M.Sc. and Ph.D. in sound and vibration from the University of Southampton in 1981 and 1985, respectively. She remained at the Institute of Sound and Vibration Research until December 1986, doing postdoctoral research on statistical modeling of shock propagation through structures. She is currently a professor of mechanical engineering at Purdue University and director of the Ray W. Herrick Laboratories, where she conducts research on sound perception, signal processing, and nonlinear system identification. She has coauthored more than 120 journal and conference papers and supervised the research of 25 M.S. thesis and Ph.D. students. She also cofounded a perception-based engineering research center that conducts collaborative research by engineering and psychology professors at Purdue. One goal of this research is to integrate the ways people perceive and are affected by noise from machinery into the design of engineering systems; for example, by coupling engineering stimulus prediction models with sound perception and human decision-making models, connections can be established between the characteristics of the engineered system and its impact on people. Dr. Davies is a member of the Institute of Noise Control Engineering (and 2007–2009, president), the Acoustical Society of America, and the American Society for Engineering Education.


Carl E. Hanson is cofounder of Harris Miller Miller & Hanson Inc., one of the leading noise and vibration consulting firms in the United States. Prior to that, he worked at Bolt Beranek and Newman Inc. as group leader for surface transportation consulting services. Dr. Hanson specializes in noise and vibration control engineering projects, particularly related to rail transportation. He is active in a wide range of rail transportation projects, including noise control designs of vehicles and facilities, compliance tests, environmental assessment, community measurement programs, and expert testimony. Dr. Hanson is a consultant for architects, engineers, and planners on projects for railroads, rapid transit, state agencies, and the federal government and has conducted research and consulting projects in Europe. He was the lead author of two guidance manuals used throughout the United States, Transit Noise and Vibration Impact Assessment (Federal Transit Administration, 1995, 2006) and High Speed Ground Transportation Noise and Vibration Impact Assessment (Federal Railroad Administration, 2005). He is a licensed professional engineer in four states, an active participant on committees of the Transportation Research Board and American Railway and Maintenance-of-Way Association, and a member of the international committee for the International Workshop on Railway Noise. He earned a Ph.D. in acoustics (1970) and an M.S. in mechanical engineering (1967), both from the Massachusetts Institute of Technology, and a B.S. in aero engineering (1965) from the University of Minnesota.


Robert D. Hellweg Jr., an independent consultant and senior consultant with Epsilon Associates, Inc., was senior member of the technical staff—acoustic engineer—with Hewlett-Packard (HP) Company (formerly Compaq and formerly Digital Equipment Corporation [DEC]) from 1981 until his retirement from HP in 2007. During his years with HP/Compaq/DEC, he reduced noise emitted by computer products, led the company’s work on acoustic standards, and coordinated acoustical activities. He also served (and continues to serve) on several national and international standards committees. He was chair of American National Standards Committee S12 from 2002 to 2009 and is currently vice chair. From 1972 to 1981 he was an environmental protection engineer for the Illinois Environmental Protection Agency; as head of noise technical operations and standards, he developed statewide noise regulations and determined practical noise reduction techniques for meeting regulatory limits. He is past president (2002), past secretary (1997–2000), and a member of the board of directors (2000–2004) of the Institute



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