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Mitzy Kieffer is an experienced professional in fundraising, marketing, and communication, currently serving as a Senior Fundraiser at 's Heeren Loo since June 2017. Kieffer has developed strategic and operational plans for fundraising from individuals, foundations, and businesses, managing the implementation and allocation of donations. Prior to this, Kieffer held roles as Marketing, Communication, and Fundraising Manager at Kinderfonds MAMAS and Fonds Psychische Gezondheid en Korrelatie, where responsibilities included strategy development and team leadership. Kieffer's background also includes online product management at Springer Media BV, ownership of an e-commerce store, and product management at TNT Post, along with a diverse sales experience in various organizations. Kieffer holds a Bachelor’s degree in Business Administration from Hogere Hotelschool Den Haag.