 He worked at Bell Laboratories for 33 years before he joined Rutgers.He has worked in voice communications, computer techniques, and electroacoustic systems.At Bell Laboratories he was the department head of the Acoustics Research Department for many years, and managed and supported work such as James E. West's invention of the electret microphone, Bishnu S. Atal's work on speech coding, David Berkley and Gary Elko's work on acoustics, Jont Allen and Joe Hall's work on psychoacoustics, James D. Johnston's work on perceptual audio coding mp3, work on speech synthesis, and Lawrence Rabiner and Aaron Rosenberg (and others) work on speech recognition.