Fabian Lenhard

Dr Fabian Lenhard is a psychologist, PhD, and data scientist based at Karolinska Institutet in Stockholm. His work focuses on understanding how people change their behaviour and how digital tools and data can make evidence-based psychological knowledge more accessible, engaging, and effective. With a background in clinical psychology, cognitive behavioural therapy, and data science, he has developed and evaluated digital interventions used in healthcare, applied behavioural science across domains from mental health to lifestyle and sustainability, and collaborated internationally to create scalable, meaningful solutions for individuals and society.

Digital behavioural interventions
Digital formats – whether text-, video-, or application-based – have the potential to increase access to effective behavioural and psychological interventions. Dr Lenhard has been involved in the development, evaluation, and implementation of digital interventions for a wide range of target audiences and conditions, with a focus on making evidence-based approaches scalable, engaging, and user-friendly.

Data in behavioural and psychological science
Data plays a central role in understanding, predicting, and supporting behavioural change. Dr Lenhard’s work uses data from clinical settings, digital platforms, and research studies to generate actionable insights, improve intervention design, and inform decision-making. Applications include monitoring change processes in real time, personalising interventions, and evaluating outcomes at scale.

Applied behaviour change
This research area focuses on understanding and facilitating meaningful, lasting behaviour change in different life domains – including lifestyle and sustainability-related behaviours. Current projects involve cross-disciplinary collaborations with KTH Royal Institute of Technology and the Stockholm Environment Institute (SEI), integrating behavioural science with insights from technology, health promotion, and sustainability research.

Support our sustainability research
If you would like to support our work on sustainable behaviour change, you can make a donation via Swish. We are currently developing an online course, "Sustainable Choices", which will be made available to the public once the scientific evaluation is complete. To support this work, Swish to 123 202 32 08 and write "Mataix-Cols, CNS, Hållbara val" in the message field. Any amount is appreciated and helps us advance our efforts.

Dr Lenhard frequently lectures on the topics of digital behavioural interventions, data-driven decision-making, and sustainable behaviour change. He is also a lecturer on the course "Introduction to social, economic and environmental sustainability and health" (KI-31006).