After finishing her studies, Margje de Koning directed documentaries for various broadcasting companies for 12 years. In 2004 Margje de Koning became a part time teacher at the Culture & Media studies (department Film& Television at the University of Amsterdam).
In August 2004, Margje de Koning became Commissioning Editor for a documentary slot of 52’ docs. This means producing and co-producing creative single 52'-documentaries on contemporary social, social-cultural and moral issues with a strong human interest angle. Since January 2005 Margje de Koning was responsible for the Television Department of IKON and from January 2012 she was Head of TV, Radio and New Media programming at IKON. From January 2016 IKON’s documentary department is incorporated in EO with Margje de Koning as Commissioning Editor Documentaries for EO & IKONdocs.
From September first 2019 Margje has become the artistic director of the filmfestival Movies that Matter