Electro-acoustics

In this interview organized through the Acoustical Society of America, German inventor and scientist Gerhard Sessler reflects on his life and career in acoustics. Sessler begins by recalling his childhood in Germany and his high school math teacher who inspired him to study physics. He describes the beginning of his undergraduate studies at Freiburg University before transferring to the University of Munich, where he took classes from physicists such as Arnold Sommerfeld. Sessler recalls moving to the University of Göttingen for his graduate studies, where he was introduced to the field of acoustics by Erwin Meyer. He describes his master’s thesis on sound propagation in rarefied gases. Sessler then explains the opportunity that led him to Bell Labs to work with Manfred Schroeder, where his projects included work on transducers, electrets, sound propagation in plasma, and architectural acoustics. He discusses his collaboration with Jim West on the development of electret microphones, first using Mylar films and then transitioning to Teflon. Sessler recalls his decision to return to both academia and Germany by accepting a position at Darmstadt University. There, he continued his work on electroacoustics, materials research, and room acoustics, and he discusses his work on developing silicon microphones. Toward the end of the interview, Sessler recounts his time as chairman of the first German acoustics association, DAGA, and then his role as founding member of the German Acoustics Society, DEGA. He also reflects on the honor of being elected to the National Inventors Hall of Fame in 1999, as well as receiving the Benjamin Franklin Medal in Electrical Engineering.

Born in Iowa in 1914, Dr. Beranek's research focuses on acoustics and Noise Control Magazine. After obtaining his Ph.D. from Harvard University in June 1940 in "communication physics", he was appointed the director of the Electro-Acoustics Laboratory at Harvard. It was in the course of war work in the early 1940s that he became interested in airborne acoustics and Noise Control Magazine, a field in which he would remain active through the Noise Control Magazine Act of 1972. Most notable contributions were in the fundamentals of electro acoustics, speech communication systems for noisy environments, and aircraft noise. Dr. Beranek was as also important contributor to the formation of professional groups in the field of audio. Professional distinctions include his presidencies of the Acoustical Society of America and later the American Academy of Arts and Sciences (beginning in 1988). Outside of acoustics, Dr. Beranek served as director of the Wang Computer Company and a member of the Massachusetts Committee on Judicial Ethics.

Born in Iowa in 1914, Dr. Beranek's research focuses on acoustics and Noise Control Magazine. After obtaining his Ph.D. from Harvard University in June 1940 in "communication physics", he was appointed the director of the Electro-Acoustics Laboratory at Harvard. It was in the course of war work in the early 1940s that he became interested in airborne acoustics and Noise Control Magazine, a field in which he would remain active through the Noise Control Magazine Act of 1972. Most notable contributions were in the fundamentals of electro acoustics, speech communication systems for noisy environments, and aircraft noise. Dr. Beranek was as also important contributor to the formation of professional groups in the field of audio. Professional distinctions include his presidencies of the Acoustical Society of America and later the American Academy of Arts and Sciences (beginning in 1988). Outside of acoustics, Dr. Beranek served as director of the Wang Computer Company and a member of the Massachusetts Committee on Judicial Ethics.

Educational background -- Cornell College, Iowa (1932-1936), Harvard University (1936-1940) with Frederick V. Hunt as thesis advisor; acoustics research at Harvard; teaching position at Massachusetts Institute of Technology (from 1947); formation of Bolt, Beranek and Newman (1948); research on electro-acoustics, architectural acoustics, acoustical impedance, aircraft acoustics, high altitude acoustics; community noise and noise control for aircraft; consulting projects including U. N. General Assembly room acoustics design (1950), Cleveland wind tunnel (1950-1951), Lincoln Center concert hall, San Diego concert hall; review of historical and modern concert hall designs; outdoor amphitheaters; president of Channel 5 television in Boston (1972-1983).