Fabian Lenhard

I am a licensed psychologist and researcher focusing on behaviour change, mental health, and sustainability. My work combines behavioural science, data analytics, and digital technology to develop, evaluate, and implement effective and scalable interventions. I am particularly interested in translating scientific knowledge into practical solutions that promote better health, sustainable lifestyles, and societal impact.

Sustainable behaviour change and climate action

My research explores how behavioural science can contribute to reducing climate impact while promoting health and well-being. I am particularly interested in developing and evaluating interventions that support sustainable lifestyles and understanding the psychological and organisational factors that enable behaviour change.

In the Sustainable Choices (Hållbara Val) research project, we have developed and evaluated a digital intervention to promote climate-friendly behaviours in a randomised controlled trial. The project is a collaboration between Karolinska Institutet, KTH Royal Institute of Technology, and the Stockholm Environment Institute (SEI). As part of this research, we have also developed the Climate Mitigation Behaviour Scale (CliMBS), an instrument designed to measure climate-relevant everyday behaviours.

I also conduct applied sustainability research in collaboration with public-sector organisations. In the Mer än bara mat (More Than Just Food) project, conducted in collaboration with the City of Stockholm, I have investigated barriers and facilitators to increasing the proportion of plant-based food in Stockholm's schools, focusing on parents' attitudes and organisational conditions for change.

Digital interventions and mental health

I have extensive experience in developing, evaluating, and implementing digital psychological interventions, particularly internet-delivered cognitive behavioural therapy (ICBT). My research encompasses interventions for a range of mental health conditions in children, adolescents, and adults.

A central aim of my work is to make evidence-based psychological interventions more accessible, effective, and user-friendly. I am particularly interested in combining digital technology and behavioural science to develop interventions that can be delivered at scale without compromising quality or effectiveness.

Measurement, data analytics, and implementation

Data and reliable measurement methods are essential for understanding behaviour change and evaluating intervention outcomes. My research draws on data from clinical practice and research studies to investigate change processes, treatment outcomes, and factors influencing implementation.

This work includes the development and psychometric evaluation of measurement instruments, large-scale analyses of treatment outcomes, and the use of data to support quality improvement and decision-making. An overarching goal is to bridge the gap between scientific research and real-world application.

Several of the psychometric scales that I have developed together with my colleagues are free of use for non-commercial applications: 

The Work and Social Adjustment Scale – Youth and Parent versions (WSAS-Y/P)

iiPAS – Internet Intervention Patient Adherence Scale for Digital Mental Health and Internet CBT

I frequently teach on the topics of digital psychology, data-driven decision making and sustainable behaviour change.