Antonia Klein was born in Munich. She studied musicology and history at the University of Vienna. She also took voice, piano and violin lessons for many years.
For ten years, she worked in the organisation and planning departments of various German speaking theatres, for example, as Head of Artistic Planning at the Nationaltheater in Mannheim and most recently, as Artistic Administrator at the Komische Oper Berlin.
Then she worked at the distinguished concert promoter Società del Quartetto in Milan and, after that, the artists’ agency Allied Artists in London.
She worked for the European office of Pinnacle Arts New York, before she opened her own agency in September 2005.
Antonia Klein also holds seminars for young singers at music colleges. One of theses seminars took place in June 2010 at the Mozarteum Salzburg. In August 2010, she was on the judging panel of the Competizione dell'Opera in Bremen and Dresden.

Anton Halbmayr was born in Waidhofen an der Ybbs (Austria). After tourism school he studied arts management at the University of Music and Dramatic Arts Vienna, and wrote his master's thesis about theory and practice of classical artist management. Then he worked as employee at the Vienna music festivals KlangBogen and OsterKlang. Next, he became the assistant to the designate director of Vienna’s new opera house Theater an der Wien. In 2008, the artist agent Robert Gilder hired Mr. Halbmayr as Artist Manager for his London office. The last six months he worked as artist booker in Dubai and realized numerous classical music projects in the Middle East. In May 2011 he joined agentur klein.
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