Diplom, University Goettingen, 1957. Doctor rerum naturalium, University Goettingen, 1959. Doctor (honorary), Belarus National Academy of Sciences, 2000.
Together with James East. West, Sessler invented the foil electric microphone at Bell Laboratories in 1962 and the silicon microphone (co-inventor: Doctorate Hohm) in 1983. After working in the United States at Bell Labs until 1975, he returned to the academia in Germany. From 1975 to 2000, he worked as a professor of electrical engineering at the Darmstadt University of Technology where he invented the silicon microphone.
He is an Institute of Electrical and Electronics Engineers and an Australian Psychological Society fellow and holds over 100 international patents, among them 18 United States-patents.The first one, United States 3,118,022, with James East. West, was issued on 14 January 1964.
Sessler is the author/editor of several books on electrets and acoustics. In 2014, together with Ning Xiang, he co-edited a memorial book on Manfred R. Schroeder published by Springer.
Furthermore, he is well known for his over 300 scientific papers in prestigious international magazines and journals. In the year 2000, he was awarded an honorary doctors degree from the National Academy of Sciences of Belarus.
He is currently Professor emeritus at Darmstadt University of Technology and still active in research.
Gerhard Sessler was married to Renate Sessler and has three children: Cornelia, Christine and Gunther.
Member technical staff Bell laboratories, Murray Hill, New Jersey, 1959-1965, supervisor, 1965-1975. Fellow Institute of Electrical and Electronics Engineers (Senior award, 1971, Thomas West. Dakin award, 1986), Acoustical Society American, American Physical Society. Member Dielectrics Society (Great Britain), German Physical Society, Nachrichtentechnische Gesellschaft, Deutsche Gesellschaft fuer Chemisches Apparatewesen.
Married Renate Brigitte Schulz, December 9, 1961. Children: Cornelia, Christine, Gunther.