Marijn started her career in immigration and refugee organisations, from where she moved into international development which finally led her to climate and environmental politics and activism. She found that these issues are all intrinsically intertwined. In 2018 she joined a small group of activists in a newly founded movement called Extinction Rebellion (XR). Here she learned about citizens' assemblies and, together with members of the Sortition Foundation, created XR's Citizens' Assembly Working Group. Their aim is to educate the movement about citizens' assemblies and deliberative democracy, and to guide XR's messaging and actions on the Third Demand: a Citizens' Assembly on Climate and Ecological Justice. Marijn is also the co-founder of the XR Podcast and host and producer for Rebel Radio.