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Mathias Harrer is an assistant professor of clinical psychology at Vrije Universiteit Amsterdam, Faculty of Behavioural and Movement Sciences.
Mathias' work focuses on using technology and biostatistical methods to improve psychological interventions for mental disorders. His research interests include predictive modeling, digital interventions, meta-epidemiological research, evidence synthesis methods, and statistical software development.
Mathias is the developer and maintainer of the Metapsy infrastructure, embedded in the WHO Collaborating Centre for Research and Dissemination of Psychological Interventions. Metapsy is a comprehensive system of living open databases and tailored software that allows for rapid evidence generation in psychological treatment research across all major mental disorders.
He is also coordinator of the Meta-Analytic Psychotherapy and Evidence Synthesis (META-SYN) Group within the German Society for Psychology (meta-syn.de).
Mathias is the maintainer of the {dmetar}, {metapsyTools} and {metapsyData} packages in R, as well as the TUM EBMPP Trial Warehouse.
- Personal Website: mharrer.dev
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Collaborations and top research areas from the last five years
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Effectiveness of Psychotherapy: Synthesis of a “Meta-Analytic Research Domain” Across World Regions and 12 Mental Health Problems
Harrer, M., Miguel, C., van Ballegooijen, W., Ciharova, M., Plessen, C. Y., Kuper, P., Sprenger, A. A., Buntrock, C., Papola, D., Cristea, I. A., de Ponti, N., Bašić, Đ., Pauley, D., Driessen, E., Quero, S., Grimaldos, J., Buendía, S. F., Botella, C., Hamblen, J. L. & Schnurr, P. P. & 15 others, , May 2025, In: Psychological bulletin. 151, 5, p. 600-667 68 p.Research output: Contribution to Journal › Article › Academic › peer-review
Open AccessFile961 Downloads (Pure) -
Psychological interventions to prevent the onset of major depression in adults: a systematic review and individual participant data meta-analysis
IPD-PrevDep Consortium, Dec 2024, In: The Lancet Psychiatry. 11, 12, p. 990-1001 12 p.Research output: Contribution to Journal › Article › Academic › peer-review
Open Access -
Long-term effects of psychotherapies for depression: an advanced meta-analysis
Cuijpers, P., Miguel, C., Aglio, E. K., van Straten, A., Karyotaki, E. & Harrer, M., Jun 2026, In: World Psychiatry. 25, 2, p. 287-294 8 p.Research output: Contribution to Journal › Article › Academic › peer-review
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Negative effects of mindfulness-based cognitive therapy and cognitive behavioural analysis system of psychotherapy for patients with 'difficult to treat' depression: protocol for a systematic review and individual participant data meta-analysis
Niemi, M., Michalak, J., Velana, M., Barnhofer, T. & Harrer, M., 16 Apr 2026, In: BMJ Open. 16, 4, p. e106362Research output: Contribution to Journal › Article › Academic › peer-review
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Psychological treatment of depression in older adults: A network meta-analysis
Cuijpers, P., Miguel, C., Karyotaki, E. & Harrer, M., 15 Apr 2026, (E-pub ahead of print) In: International Psychogeriatrics. 7 p., 100213.Research output: Contribution to Journal › Article › Academic › peer-review
Open Access
Datasets
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{metapsyTools}: Several R Helper Functions for the "Metapsy" Database
Harrer, M. (Creator), Kuper, P. (Contributor), Sprenger, A. A. (Contributor) & Cuijpers, P. (Contributor), Zenodo, 2022
DOI: 10.5281/zenodo.6566632, http://tools.metapsy.org
Dataset / Software: Software
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metapsy-project/data-peer-support-interventions: Version 23.0.3
Harrer, M. (Creator), Zenodo, 1 Mar 2023
Dataset / Software: Dataset
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metapsy-project/data-ptsd-psyctr: Version 23.0.3
Clara Miguel (Creator) & Mathias Harrer (Creator), Zenodo, 26 Oct 2023
Dataset / Software: Dataset
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metapsy-project/data-psychosis-psyctr: Version 23.1.4
Miguel, C. (Creator), Djordje (Creator) & Harrer, M. (Creator), Zenodo, 31 Mar 2023
Dataset / Software: Dataset
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metapsy-project/data-total-response: Version 23.0.1
Harrer, M. (Creator), Zenodo, 4 Oct 2023
Dataset / Software: Dataset