10/2018Research Scientist, Psychological Assessment, University of Kassel
09/2018Master in Psychology (M.Sc.), University of Kassel
06/2016Bachelor in Psychology (B.Sc.), FernUniversität in Hagen
10/2014Bachelor in Sociology (B.A.), Georg-August-University Göttingen

Professional Experience



Scientific Online Tutor for the bachelor thesis preparation course in Psychology, FernUniversität in Hagen



Tutor for Psychological Assessment, University of Kassel



Research Internship, Community Psychology, FernUniversität in Hagen



Research Internship, Work and Organisational Psychology, FernUniversität in Hagen

Awards and prizes

09/2019Pearson Prize for an outstanding Master's thesis in the field of Psychological Assessment (awarded by the DPPD section of the DGPs)
  • Promise and pitfalls of machine learning algorithms in psychological research
  • Development of optimized short scales using metaheuristics
  • Personality assessment and development


  • Jankowsky, K., Zimmermann, J., Jaeger, U., Mestel, R., & Schroeders, U. (2023, September 27). First impressions count: Therapists’ impression on patients’ motivation and helping alliance predicts psychotherapy dropout. Retrieved from
  • Schroeders, U., Loos, A., Wiedemann, S., & Jankowsky, K. (2023, March 10). Is it Just a Game? Development and Validation of a Deductive Version of Mastermind as Measure of Reasoning Ability.
  • Schroeders, U., Mariss, A., & Jankowsky, K. (2023, February 27). Predicting juvenile delinquency and criminal behavior in adulthood using machine learning.

Peer-reviewed articles

  • Jankowsky, K., Krakau, L., Schroeders, U., Zwerenz, R., & Beutel, M. E. (in press). Predicting treatment response using machine learning: A Registered Report. British Journal of Clinical Psychology.
  • Schroeders, U., Morgenstern, M., Jankowsky, K., & Gnambs, T. (in press). Short-scale construction using meta-analytic Ant Colony Optimization: A demonstration with the Need for Cognition Scale. European Journal of Psychological Assessment.
  • Jankowsky, K., Steger, D., & Schroeders, U. (2024). Predicting lifetime suicide attempts in a community sample of adolescents using machine learning algorithms. Assessment, 31(3), 557–573.
  • Olaru, G., Jankowsky, K., & Allemand, M. (2023). Structural and inter-individual differentiation in personality across the adult lifespan. European Journal of Personality.
  • Terry, J., Ross, R. M., Nagy, T., Salgado, M., Garrido-Vásquez, P., Sarfo, J. O., … Field, A. P.. (2023). Data from an international multi-centre study of statistics and mathematics anxieties and related variables in university students (the SMARVUS dataset). Journal of Open Psychology Data.
  • Wendt, L. P., Jankowsky, K., Zimmermann, J., Schroeders, U., Nolte, T., Fonagy, P., Montague, P. R., & Olaru, G. (2022). Mapping established psychopathology scales onto the Hierarchical Taxonomy of Psychopathology (HiTOP). Personality and Mental Health, 17(2), 117-134.
  • Steger, D., Jankowsky, K., Schroeders, U., & Wilhelm, O. (2022). The road to hell is paved with good intentions: How common practices in scale construction hurt validity. Assessment, 30(6), 1811–1824.
  • Jankowsky, K. & Schroeders, U. (2022). Validation and generalizability of machine learning prediction models on attrition in longitudinal studies. International Journal of Behavioral Development, 46(2), 169–176.
  • Olaru, G., & Jankowsky, K. (2021). The HEX-ACO-18: Developing an age-invariant HEXACO short scale using Ant Colony Optimization. Journal of Personality Assessment.
  • Tierney, W., Hardy, J. H., III., Ebersole, C., Viganola, D., Clemente, E., Gordon, M., Hoogeveen, S., Haaf, J., Dreber, A.A., Johannesson, M., Pfeiffer, T., Chapman, H., Gantman, A., Vanaman, M., DeMarree, K., Igou, E., Wylie, J., Storbeck J., Andreychik, M.R., McPhetres, J., Vaughn, L.A., Culture and Work Morality Forecasting Collaboration, & Uhlmann, E. L. (2021). A creative destruction approach to replication: Implicit work and sex morality across cultures. Journal of Experimental Social Psychology, 93, 104060. (Member of Forecasting Collaboration)
  • Tierney, W., Hardy, J. H., III., Ebersole, C., Leavitt, K., Viganola, D., Clemente, E., Gordon, M., Dreber, A.A., Johannesson, M., Pfeiffer, T., Hiring Decisions Forecasting Collaboration, & Uhlmann, E.L. (2020). Creative destruction in science. Organizational Behavior and Human Decision Processes, 161, 291-309. (Member of Forecasting Collaboration)
  • Jankowsky, K., Olaru, G., & Schroeders, U. (2020). Compiling measurement invariant short scales in cross-cultural personality assessment using Ant Colony Optimization. European Journal of Personality, 34, 470–485.