His research interests include environmental preferences, psychological restoration, and the analysis and change of pro-environmental behaviour. He cooperates with scientists of other disciplines (ecologists, architects, landscape architects, engineers), government institutions, enterprises, and NGO’s to develop and research approaches that may increase sustainability, biodiversity, scenic beauty, and well-being. He is a member of the scientific organizations IAPS, IAAP, ASPO and on the editorial board of Applied Psychology; An International Review. He likes cycling, running, and speed skating, and therefore has a direct, personal interest in a clean and beautiful world that is not degraded by global warming.