acoustic engineers, acoustical contractors, acoustical consultants

Key Personnel


Carl Rosenberg, Principal

Carl, a Fellow of the Acoustical Society of America (ASA), specializes in architectural acoustics. His consulting career began in 1971 when he joined the country’s leading acoustics firm, Bolt Beranek and Newman. He then co-founded Acentech in 1988. His projects encompass a variety of building types, including performance halls, churches, office building, athletic facilities, and private residences to name just a few. Carl not only consults with architects across the US, but also contributes to the acoustics industry by serving on the Technical Committee on Architectural Acoustics (TCAA) for the ASA. He especially enjoys teaching courses in architectural acoustics at Massachusetts Institute of Technology (MIT) and Princeton University. Carl holds BA from Princeton and Masters in Architecture from MIT.

Eric Wood, Principal

Eric has applied his talents for more than forty years to hundreds of clients' projects. He directs and provides technical input to the measurement, evaluation, and control of noise and vibration during the design, construction, and operation of major energy works, transportation systems, and industrial plants. He is President of the Institute of Noise Control Engineering of the USA (INCE/USA), President of the INCE Foundation, a Fellow of the Acoustical Society of America (ASA), and co-founded Acentech in 1988. Eric holds a B.S. in Mechanical Engineering from the University of Hartford.

J. Christopher Jaffe, 1927-2013

A pioneer in the in the field of acoustical design, Chris was a valued member of Acentech's Studio A team for over four years. Read our remembrance here.

Ramon Nugent, Director, West Coast Office

Ray has over 38 years of experience and manages projects for industrial, transportation, community, environmental noise and vibration studies and more. He has conducted numerous CEQA and NEPA environmental noise studies on light and heavy rail transportation, highway and street traffic, as well as urban and suburban development. Ray’s projects have included computer models for noise prediction and evaluation. His work incorporates noise models and the application of meteorological data to determine long-range noise propagation and detection. Ray is a Registered Professional Engineer and holds a B.S. in Engineering Science from Iowa State University.

Benjamin Markham, Director, Architectural Acoustics

Ben not only directs Acentech's Architectural Acoustics and Mechanical Systems Group, but is also a leading developer of pre-construction auralizations and acoustical modeling for various project types. His projects involve architectural acoustics, mechanical systems noise and vibration control, and environmental acoustics consulting for performing arts centers and other institutional and commercial facilities. In addition to his consulting work, Ben is a visiting lecturer in the School of Architecture at MIT, and has lectured at Harvard University, Northeastern University, Roger Williams University, the Rhode Island School of Design, and Syracuse University. He holds an M.S. in Architectural Acoustics from Rensselaer Polytechnic Institute and a BSE from Princeton University.

Jim Barnes, Principal Consultant

Jim's projects cover interior and community noise control studies for existing power and industrial plants, prediction of construction and operation noise levels, and ambient sound studies for proposed industrial sites and transportation corridors for environmental impact statements. During the course of his 35+ years of acoustics consulting, he has developed specialized knowledge of industrial noise and vibration control, with an emphasis on serving the power industry. Jim is also versed in the evaluation and resolution of potential vibration problems at proposed sites for microelectronics and optics facilities. He holds a Masters of Engineering from Cornell University.

Aaron Bétit, Senior Consultant

Since 1997 Aaron has managed a wide range of acoustics projects including landmark buildings, corporate headquarters, and environmental noise studies. His expertise includes consulting on ground-up design as well as diagnostic advice for existing facilities and structures with acoustical complications. Aaron’s projects include theaters, studios, education facilities, performance spaces, as well as healthcare, commercial, public, and residential construction. His environmental noise experience includes acoustical design and computer modeling of power plants, roadways, warning sirens, and water treatment plants. Aaron holds a Bachelor of Science in Engineering with an emphasis in Acoustics and Music from the University of Hartford.


Richard Closs, Director, Audiovisual and Sound System Design

Ric’s 25 years of design experience includes a multitude of audiovisual and sound systems for a variety of spaces, particularly large venues -- arenas, stadia, worship spaces, conference centers, and performance centers. He has organized and managed the integration of audio design/build systems from contract phase to completion for hundreds of projects. Ric leads Acentech’s Systems Group of AV, sound, and IT consultants. He earned the designation of Certified Technology Specialist Design (CTSD) by the International Communications Industries Association (ICIA) in 1995.

Larry Philbrick, Principal Consultant

Since 1975, Larry has consulted on an array of projects in sound and audiovisual systems design as well as architectural acoustics. His experience includes speech reinforcement and sound systems for arenas, auditoriums, concert halls, hotels, churches, and conference centers in the U.S. and abroad.  He has designed audio-visual systems for conference rooms and boardrooms, teleconference rooms, and electronic masking systems (used to obtain speech privacy in offices).  In architectural acoustics and noise control, he has consulted on projects including concert halls, arenas, music practice and rehearsal rooms, residences, and offices.  Larry’s previous experience included training and work in physics, computer programming, architecture, and mechanical engineering.  He has taught architectural acoustics at the Boston Architectural Center.  Larry earned the designation of Certified Technology Specialist (CTS) by the International Communications Industries Association (ICIA) in 2004.He holds a M.Arch from Harvard University and an A.B. from Brown University. 

David Bateman, Principal Consultant

David is a Certified Technology Specialist in Design from InfoComm International, the governing body that oversees the audiovisual industry. He has been designing sound, video, and backstage systems for the last 12 years. His recent work includes leading the sound system renovation of Strand Theater in Dorchester, MA and designing the sound and backstage systems for the Calderwood Pavilion in Boston, Massachusetts. David became heavily involved in music at an early age, and was introduced to the inner workings of a theater at Interlochen Arts Academy. In addition to being an accomplished violist, David has worked as a lighting designer, rigger, stage manager, and Technical Director. Finding his groove behind a mixing console, David has mixed live shows in a variety of venues - from theme parks to cruise ships. David holds a Bachelor of Music from Mercyhurst University in Viola, and a Master of Arts in Set Design from Villanova University.

Larry McIntyre, Principal Consultant

Mr. McIntyre has over twenty-five years of audiovisual, teleconferencing, and network design experience for Corporate, Healthcare, Higher Education, and Hospitality clientele as both a systems contractor and a design consultant. He is a member of InfoComm International®, which has recognized him as a Certified Technology Specialist in Design (CTS-D). He is also a LEED Accredited Professional. He holds a Masters of Business Administration from Saint Joseph’s University and a Bachelors of Science in Electrical Engineering Technology from Temple University.


Jeffrey Zapfe, President

Jeff joined Acentech in 1998, led the company's Noise and Vibration group, and now serves as President. His projects cover a variety of areas including the design and analysis of vibration sensitive facilities; dynamic structural analysis; transportation noise and vibration measurement/analysis; construction vibration measurement and analysis; site analysis for vibration sensitive equipment; and high-performance vibration isolation system design. His work includes the application of finite element analysis, signal processing, and experimental modal analysis. Jeff's most recent projects include construction vibration effects on sensitive facilities, human response to rail vibration, footfall-induced vibration analysis, and environmental vibrations due to nearby rail systems. He holds a Ph.D. in Aerospace Engineering from The Pennsylvania State University.

Eric E. Ungar, Chief Engineering Scientist

Eric has since 1958 been involved in research and consulting in vibration and in the related fields of structure-borne sound, structural and machinery dynamics, stress analysis, and noise and vibration control; he is considered one of the topmost experts in the vibration area. The American Society of Mechanical Engineers awarded him its Gold Medal for Noise Control and Acoustics for “fundamental contributions to noise and vibration control engineering involving structural damping, vibration isolation, vibration of complex structures as applied to aerospace structures, ships, machinery, and buildings.” He has received similar recognition from the Acoustical Society of America and the Institute for Noise Control Engineering, of which organizations he also has served as President, and he has been honored with a lifetime achievement award by the Shock and Vibration Information Center. Eric is a registered professional engineer and the author of over 200 publications, including over a dozen handbook and monograph chapters. He holds the Doctor of Engineering Science degree from New York University.


David Bowen, Director, Noise and Vibration

With over 30 years of experience, David performs sound and vibration analyses associated with product noise studies. His work includes source and path identification efforts that lead to effective modifications; the development, implementation and evaluation of various signal processing procedures for use in machinery diagnostics, active noise/vibration control, and remote sensing. David is a member of Acoustical Society of America, the Audio Engineering Society, Society of Automotive Engineers, and served as Technical Program Chair at the 127th Meeting of the Acoustical Society of America. He holds both a Master of Science Degree and Engineer’s Degree in Mechanical Engineering from MIT.

Gladys Unger, Senior Consultant

Gladys has over 20  years of acoustics and vibration experience.  Much of her efforts involve product noise analysis, sound quality studies, and machinery diagnostics.  Her work involves testing and measurement of acoustical signals, vibration, pressure fluctuations, and those quantities related to fluctuating forces within the machinery under study.  Gladys creates prototypes and assembles diagnostic systems.  She also handles the “human side” of jury studies: designing the jury forms, convening juries, administering the testing, and reducing the data.  Gladys is an active participant in the Greater Boston Chapter Acoustical Society of America. She holds a Ph.D. and M.S. in Physics from the University of Pittsburgh.