Jean-Damien Grassias
Jean-Damien Grassias
MCF
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Jean-Damien Grassias joined RITM in September 2025 as Assistant Professor of Marketing. Trained in experimental social psychology and holding a PhD in management sciences, he studies social change by combining psychology, social marketing, and systems thinking. His research focuses primarily on household waste sorting in collective housing, in collaboration with eco-organizations, social housing providers, local authorities, and social and solidarity economy actors. To analyze the decisions of residents and local stakeholders, he uses both quantitative and qualitative methods, including Necessary Condition Analysis, Structural Equation Modeling, and Causal Loop Diagrams. More broadly, his research program aims to design and test social marketing strategies within a systemic perspective on change.
Assistant Professor of Management
MCF
Management
Membre actuel
IUT Sceaux

Consumer behaviour and behavioural science
Social marketing and behaviour change
Sustainable consumption and pro-environmental behaviour
Place, residential environments and everyday practices
Systems thinking and systemic approaches to social change

Change Management
Digital Transformation of Organizations
Digital Marketing
Social Psychology

Conference presentations

Grassias, J.-D. (2026). Waste sorting in disadvantaged collective housing: A Systems Social Marketing perspective. European Social Marketing Conference, July 2026.

Grassias, J.-D. & Piris, Y. (2025). Du changement individuel au changement systémique : le cas du tri des déchets en quartier prioritaire. 41st International Congress of the French Marketing Association (AFM), Lille, France.

Grassias, J.-D. & Piris, Y. (2024). Améliorer l'explication du tri des déchets en milieu urbain densément peuplé : un modèle intégratif fondé sur les processus duals de la décision. 40th International Congress of the French Marketing Association (AFM), Paris Dauphine, France.

Grassias, J.-D. & Piris, Y. (2024). The Contribution of Thinking Modes to Better Understand the Impact of Place on Sorting Behavior. Academy of Marketing Science Annual Conference, Miami, FL, USA.

Grassias, J.-D. & Piris, Y. (2023). Food Waste Sorting: Exploring the Role of Collective Housing and Place Attachment. Academy of Marketing Annual Conference and Doctoral Colloquium, University of Birmingham, UK.

Public engagement

Grassias, J.-D. & Piris, Y. (2026). “Des nudges au marketing social systémique : du petit geste au grand changement.” The Conversation, 23 March 2026.

Grassias, J.-D. (2026). Pourquoi les dispositifs de tri fonctionnent-ils ici… et échouent-ils ailleurs ? Invited webinar, Institut du Marketing Social, 3 February 2026. Presentation of research on collective housing, waste sorting and systemic approaches to social change.

Grassias, J.-D. (2021). “L’attachement au lieu : quel impact sur les écogestes et la sensibilisation ?” Terravox. Research outreach article on place attachment and pro-environmental behaviour.

Professional dissemination

Grassias, J.-D. (2025). Behavioural sciences applied to waste sorting and urban waste management. Invited professional training session organised by Citeo, Marseille, France, for representatives and public communicators from metropolitan authorities and regional waste-management organisations. Topics included dual-process approaches, cognitive biases, nudges, social norms, and systemic approaches to behavioural change. Joint training session with Nicolas Fieulaine.

Grassias, J.-D. (2023–2024). Research dissemination video series on behavioural sciences and social marketing for Terravox, addressing segmentation, consumer insight, behavioural change, social norms and waste-related behaviours. The series was produced in connection with research supported by Citeo and the Région Île-de-France

Educational Innovation Coordinator – IUT de Sceaux, Université Paris-Saclay
Sustainability Coordinator (“IUT Vert”) – IUT de Sceaux, Université Paris-Saclay

Grassias, J.-D. & Piris, Y. (2026). Bridging practice theory and behavioral science to understand and strengthen recyclable waste sorting in collective housing. European Journal of Marketing, 60(3), 670–691. https://doi.org/10.1108/EJM-03-2024-0242