This PhD position at Utrecht University, embedded within the Copernicus Institute of Sustainable Development, offers a unique opportunity to contribute to the ECCO project (Empowering Citizen COllectives in societal transitions). The project investigates how grassroots citizen collectives can become powerful drivers of societal change, particularly in the context of sustainability transitions. The research will focus on how these collectives mobilise broad groups of citizens, build organisational and digital infrastructures for large-scale engagement, and translate insights into practical strategies for societal partners. As a PhD candidate, you will use qualitative and action research methods to analyse current mobilisation efforts, identify challenges, and co-develop practical approaches with networks such as LSA, Energie Samen, and Cooplink. Your work will involve conducting interviews, participant observation, document reviews, and facilitating workshops on infrastructure development. You will also create practical catalogues of digital and organisational tools, develop scenarios for expanding citizen mobilisation, and produce both academic publications and practitioner-oriented materials. You will join a cohort of 11 PhD candidates from multiple Dutch universities and disciplines, including social psychology, urban planning, governance studies, and design thinking. The position offers real-world impact, innovative research methods, a strong support network, and opportunities for societal engagement and career development. The Copernicus Institute is renowned for its interdisciplinary approach to sustainability research and teaching, and the Faculty of Geosciences at Utrecht University is a leading centre for research on the Earth's systems and human-environment interactions. Applicants should have a relevant academic background, strong qualitative research skills, and an interest in sustainability transitions, social innovation, and social movement theories. Practical experience with community organising or social design is an asset. Dutch proficiency is highly valued, and excellent English is required (with specific language test criteria outlined in the post). The position is for one year initially, with extension to four years upon successful assessment, and includes a competitive salary, benefits, and professional development opportunities. To apply, submit your CV, motivation letter, academic transcripts, reference letters, English language test results (if required), and a research outline via the Utrecht University application portal by 15 January 2026. For more information, visit the official job posting.