Thomas Ledermann, Ph.D.

tom headshot

Get to know Dr. Ledermann


In my research, I aim to develop new or extend and combine existing methods to address novel or more specific questions, especially for the analysis of dyads and triads, such as couples and families. Some of the better-known papers my colleagues and I have done include the analysis of mediation and patterns in dyadic data and the phantom model method. Other approaches we have discussed are dyadic hybrid models, the dyad-level growth curve model, and the multimember multigroup Actor-Partner Interdependence Model for the analysis of group composition. More recently, we proposed the Caring for Bliss Scale to measure the extend of caring for bliss or genuine happiness. I enjoy collaborating with scholars from different fields and working with students. I developed with Dr. Rudaz a Mindfulness- and Compassion-Based Stress and Resilience Training. We have started collecting data to evaluate this training, and we are offering prospective students the opportunity to work in this research project.


  • B.S. Electrical Engineering, Zurich University of Applied Sciences
  • M.S. Psychology and Philosophy, University of Fribourg
  • Ph.D. Psychology, University of Fribourg
  • Habilitation (venia legendi), University of Basel

Publications and Other Scholarly Activities

Ledermann, T., Rudaz, M., Wu, Q., & Cui, M. (in press). Determine power and sample size for the simple and mediation Actor–Partner Interdependence Model. Family Relations.

Rudaz, M., Ledermann, T., May, R. W., & Fincham, F. D. (2020). A brief scale to measure caring for bliss: Conceptualization, initial development, and validation. Mindfulness, 11(3), 615-626.

Ledermann, T., Rudaz, M., & Grob, A. (2017). Analysis of group composition in multimember multigroup data. Personal Relationships, 24, 242-264.

Ledermann, T., & Macho, S. (2014). Analyzing change at the dyadic level: The Common Fate Growth Model. Journal of Family Psychology, 28, 204-213.

Ledermann, T., & Kenny, D. A. (2012). The common fate model for dyadic data: Variations of a theoretically important but underutilized model. Journal of Family Psychology, 26, 140-148.

Ledermann, T., Macho, S., & Kenny, D. A. (2011). Assessing mediation in dyadic data using the actor-partner interdependence model. Structural Equation Modeling, 18, 595-612.

Macho, S., & Ledermann, T. (2011). Estimating, testing, and comparing specific effects in structural equation models: The phantom model approach. Psychological Methods, 16, 34-43.

Kenny, D. A., & Ledermann, T. (2010). Detecting, measuring, and testing dyadic patterns in the Actor-Partner Interdependence Model. Journal of Family Psychology, 24, 359-366.


  • Faculty Excellence Award, College of Health and Human Sciences (2019).
  • Top 5% reviewer in 2019 for Journal of Social and Personal Relationships.
  • Fellowship for advanced researchers from the Swiss National Science Foundation.
  • Fellowship for prospective researchers from the Swiss National Science Foundation.

Research Projects