The ICA congratulates Jean Mattei on reaching 100 years of age on 21 September 2020 and recognizes his outstanding contributions to acoustics during the century. At the end of the sixties Jean Mattei became President of GALF (Association of French Speaking Acousticians which later became SFA, the French Acoustical Society). There he developed GAIE, the Industrial and Environmental Acoustics Group which would become Member of International-INCE. In 1969 he became a member of the ICA (International Commission of Acoustics, the seventh commission of IUPAP). He served as the Chairman from 1972 to 1975, and, in 1983 organized the 11th ICA Congress in Paris as General Secretary.