Cultural manager, publicist and impresario, Sonia Simmenauer was born in the United States, but grew up in Paris. During her studies of languages at the Sorbonne, Sonia Simmenauer did several internships in different concert agencies. In 1982 she moved to Hamburg and began working for the chamber music department of the Konzertdirektion Schmid in Hanover.

In 1989 she opened her Impresariat Simmenauer in Hamburg, with the intention of founding a string quartet agency. Since then, she has represented many of the world's leading string quartets, such as the Alban Berg and Guarneri Quartets for 26 years, as well as the Arditti, Tokyo, Artemis, Ebene, Belcea, Jerusalem, Schumann, Modigliani and many other quartets. Later on, soloists joined the roster, such as the violinists Gidon Kremer, Isabelle Faust and Vadim Gluzman, the pianists Piotr Anderszewski and Alexander Melnikov, the mandolinist Avi Avital or the composer Lera Auerbach and the singer Georg Nigl.

In addition to her main professional activity, she has an extensive teaching activity: she taught at the Conservatory of Lübeck (1997), the Hanns-Eisler Conservatory in Berlin (1998-2000) and the University of Witten-Herdecke (2004-2008). Since 2010, Sonia Simmenauer has been an honorary professor at the Musikhochschule Hamburg in the field of music mediation.

In 2008, she opened the Jewish café Leonar and the Jewish salon in Hamburg's Grindel district and published a book "Muss es sein" with Berenberg Verlag, which was praised by the press, in which she gives a varied overview of the life of professional quartet formations. A new, expanded edition was published in March 2021.

In 2009, Sonia Simmenauer moved her Impresariat from Hamburg to Berlin. In 2020 she handed over the direction of the office to her son Arnold Simmenauer in order to devote herself to working with young musicians at the beginning of their careers.