of Noise Control Engineering of the USA (INCE/USA) and a member of the board of directors of the INCE Foundation. He has also led the Information Technical Industry Council and Ecma-International technical committees on product noise. Mr. Hellweg is a fellow of the Acoustical Society of America, an INCE board-certified noise control engineer, and a licensed professional engineer. He received a B.S. (1966) and an M.S. (1971) in aeronautical and astronautical engineering from the University of Illinois.

Gerald C. Lauchle earned a B.S. (1968) and an M.S. (1970) in aerospace engineering and a Ph.D. in engineering acoustics (1974), all from the Pennsylvania State University. He was subsequently appointed to a faculty position at his alma mater, where he taught, conducted research, and served the university for 38 years. He retired in 2006 as Professor of Acoustics Emeritus, but he continues to consult in hydrodynamics and acoustics, with a strong emphasis on the physics and control of flow-induced noise. Dr. Lauchle has supervised 23 master’s theses and 17 Ph.D. dissertations. The author or coauthor of 80 refereed journal articles, parts of six books, 38 nonrefereed journal articles, 142 reports, 56 workshops, 89 professional meeting presentations, and more than 100 other presentations, he also holds two patents and has one pending. He is a fellow of the Acoustical Society of America and a board-certified member of the Institute of Noise Control Engineering of the USA (INCE/USA). In 2002 he received the INCE/USA Martin Hirschorn IAC Award for coauthoring the best paper on a new or improved cost-effective noise control process. He has chaired several INCE/USA committees, served on the board of directors (1997–2000, 2006–2007), and was technical chair of the Sources and Propagation Committee (1998–2002), vice president for technical activities (2003), executive vice president (2004, 2006–2007), and president (2005). Dr. Lauchle has been an associate editor of Noise Control Engineering Journal and the Journal of the Acoustical Society of America.

Richard H. Lyon has been working in acoustics, vibrations, and dynamics since the early 1950s. He graduated from Evansville College (now the University of Evansville) in 1952 and earned his Ph.D. in physics from Massachusetts Institute of Technology (MIT) in 1955. In 1956 he joined the faculty of the Electrical Engineering Department at the University of Minnesota, and in 1959 he was promoted to associate professor. In 1960 he joined Bolt Beranek and Newman (BBN) Inc., where he worked on problems of sound structure interaction and excitation of structures by turbulence for industry, the National Aeronautics and Space Administration, and the U.S. Department of Defense. In 1967 he became BBN corporate vice president. In 1970 Dr. Lyon was appointed professor of mechanical engineering at MIT, where he led research on noise propagation and machinery noise and taught courses in basic and applied acoustics. He retired from MIT in 1995 and began working full time at RH Lyon Corp (RHLC). In 2005 the RHLC product design, machinery diagnostics, and structural acoustics activities were joined with Acentech Inc., where Dr. Lyon, as chief scientist, continues his work on transducer design and the design and diagnostics of products, primarily with regard to sound and vibration.

Ian A. Waitz is Jerome C. Hunsaker Professor and head of the Department of Aeronautics and Astronautics at the Massachusetts Institute of Technology (MIT) and director of the Partnership for Air Transportation Noise and Emissions Reduction (PARTNER), a Center of Excellence sponsored by the Federal Aviation Administration (FAA), the National Aeronautics and Space Administration (NASA), and Transport Canada. His principal areas of interest are modeling and evaluation of climate and impacts of aviation on local air quality and noise and assessing technological, operational, and policy options for mitigating these impacts. Professor Waitz has written approximately 75 technical publications, including a report to Congress on aviation and the environment. He holds three patents and has been a consultant for many organizations. From 2002 to 2005, he was deputy head of the Department of Aeronautics and Astronautics at MIT. He has also been an associate editor of the AIAA Journal of Propulsion and Power. In 2003 Professor Waitz received a NASA Turning Goals into Reality Award for noise reduction, and in 2007 he was awarded the FAA 2007 Excellence in Aviation Research Award. He is a fellow of the American Institute of Aeronautics and Astronautics and a member of the American Society of Mechanical Engineers and the American Society for Engineering Education. He teaches graduate and undergraduate courses in thermodynamics and energy conversion, propulsion, and experimental projects. He was honored with the 2002 MIT Class of 1960 Innovation in Education Award and an appointment as an MIT MacVicar Faculty Fellow in 2003. Professor Waitz received a B.S. in aerospace engineering from the Pennsylvania State University in 1986, an M.S. in aerospace engineering from George Washington University in 1988, and a Ph.D. in aeronautics from the California Institute of Technology in 1991.

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