After twenty years working for the government, Mary decided to make a major career change into classical music. She started with the artistic directorship of a small music venue and as advisor for a comedienne. Soon after, she founded her own agency (2003) and she became the CEO of the Rotterdam Chamber Orchestra. Whilst her own agency was blossoming she became co-director of an agency based in the United Kingdom in 2006. In November 2010 she decided to return to her own agency, Mary Kaptein Management.
Besides being an artists’ manager, Mary has become a consultant for classical music venues, political organisations, festivals, competitions and orchestras on marketing, fundraising and artistic views.
She has promoted and organized many concerts at the Amsterdam Concertgebouw, the Musikverein in Vienna, New York`s Carnegie Hall, venues in London and the Netherlands - and she has organized many private events.