Starting in social psychology under who later became known as the biggest psychology fraud, they shifted their focus to meta-research. As a Mozilla Open Science Fellow and Shuttleworth Fellow they developed what would become ResearchEquals, to give researchers the tools to share all of the research process, not just the pretty results. In 2019, they founded Liberate Science GmbH to house the work and have been stewarding ResearchEquals since.

Experience (most recent to least recent)

  • CEO and Founder @ Liberate Science GmbH (October 2019-Present)

  • Senior Software Engineer @ data.org (January 2024 thru December 2025 on a time limited contract)

  • Project Officer @ BIH QUEST Center; Charité University (January-July 2019 on a time limited contract)

  • PhD Candidate @ Tilburg University (2014-2018)

  • Research Master, track Methods and Statistics @ Tilburg University (2012-2014)

  • Bachelor of Psychology, track Social Psychology @ Tilburg University (2009-2012)

Signatory of...

Over the years I noticed I was signing a lot of open letters, petitions, and more. Here's as best of a chronological list as I can (re)construct. It is incomplete before 2027.

2026

2025

2024

2023

Publications

Bakker, Marjan, Chris H. J. Hartgerink, Jelte M. Wicherts, and Han L. J. van der Maas. “Researchers’ Intuitions About Power in Psychological Research.” Psychological Science 27, no. 8 (2016): 1069–77. https://doi.org/10.1177/0956797616647519.

Fayant, Marie-Pierre, Dominique Muller, Chris Hubertus Joseph Hartgerink, and Anthony Lantian. “Is Ostracism by a Despised Outgroup Really Hurtful?” Social Psychology 45, no. 6 (2014): 489–94. https://doi.org/10.1027/1864-9335/a000209.

Hartgerink, Chris. “Verified, Shared, Modular, and Provenance Based Research Communication with the Dat Protocol.” Publications 7, no. 2 (2019): 40. https://doi.org/10.3390/publications7020040.

Hartgerink, Chris, and Stephen George. “Problematic Trial Detection in ClinicalTrials.Gov.” Research Ideas and Outcomes 1 (December 2015): e7462. https://doi.org/10.3897/rio.1.e7462.

Hartgerink, Chris H. J. “688,112 Statistical Results: Content Mining Psychology Articles for Statistical Test Results.” Data 1, no. 3 (2016): 14. https://doi.org/10.3390/data1030014.

Hartgerink, Chris H. J. “Do Not Trust Science — Verify It.” The Winnower, ahead of print, September 15, 2015. https://doi.org/10.15200/winn.144232.26366.

Hartgerink, Chris H. J. “Reanalyzing Head et al. (2015): Investigating the Robustness of Widespread p-Hacking.” PeerJ 5 (March 2017): e3068. https://doi.org/10.7717/peerj.3068.

Hartgerink, Chris H. J. “Re-Envisioning a Future in Scholarly Communication.” 2017. http://library.ifla.org/1631/.

Hartgerink, Chris H. J. “Research Misconduct: Speed Translation of Misconduct Reports.” Nature 522 (June 2015): 419. https://doi.org/10.1038/522419d.

Hartgerink, Chris H. J., Robbie C. M. van Aert, Michèle B. Nuijten, Jelte M. Wicherts, and Marcel A. L. M. van Assen. “Distributions of P-Values Smaller than .05 in Psychology: What Is Going On?” PeerJ 4 (April 2016): e1935. https://doi.org/10.7717/peerj.1935.

Hartgerink, Chris H. J., Ilja van Beest, Jelte M. Wicherts, and Kipling D. Williams. “The Ordinal Effects of Ostracism: A Meta-Analysis of 120 Cyberball Studies.” PLOS ONE 10, no. 5 (2015): e0127002. https://doi.org/10.1371/journal.pone.0127002.

Hartgerink, Chris H. J., E. M. Kemper, Markus W. Hollmann, and Gerben ter Riet. “Analyzing DECREASE Trials to Estimate Evidence of Data Manipulation.” F1000Research 6 (November 2017): 1995. https://doi.org/10.12688/f1000research.12584.1.

Hartgerink, Chris H. J., J. M. Wicherts, and M. A. L. M. van Assen. “Too Good to Be False: Nonsignificant Results Revisited.” Collabra: Psychology 3, no. 1 (2017): 9. https://doi.org/10.1525/collabra.71.

Hartgerink, Chris H. J., and Marino van Zelst. “‘As-You-Go’ Instead of ‘After-the-Fact’: A Network Approach to Scholarly Communication and Evaluation.” Publications 6, no. 2 (2018): 21. https://doi.org/10.3390/publications6020021.

Hartgerink, Chris, and Peter Murray-Rust. Extracting Data from Vector Figures in Scholarly Articles. September 6, 2017. https://doi.org/10.5281/zenodo.839536.

Hartgerink, Chris, and Jelte Wicherts. “Research Practices and Assessment of Research Misconduct.” ScienceOpen Research, ahead of print, August 2, 2016. https://doi.org/10.14293/S2199-1006.1.SOR-SOCSCI.ARYSBI.v1.

Hartgerink, Chris, Jelte Wicherts, and Marcel van Assen. “The Value of Statistical Tools to Detect Data Fabrication.” Research Ideas and Outcomes 2 (April 2016): e8860. https://doi.org/10.3897/rio.2.e8860.

Nuijten, Michele B., Marcel A. L. M. van Assen, Chris Hubertus Joseph Hartgerink, Sacha Epskamp, and Jelte M. Wicherts. The Validity of the Tool “Statcheck” in Discovering Statistical Reporting Inconsistencies. n.d. https://doi.org/10.31234/osf.io/tcxaj.

Nuijten, Michèle B., Chris H. J. Hartgerink, Marcel A. L. M. van Assen, Sacha Epskamp, and Jelte M. Wicherts. “The Prevalence of Statistical Reporting Errors in Psychology (1985–2013).” Behavior Research Methods 48, no. 4 (2016): 1205–26. https://doi.org/10.3758/s13428-015-0664-2.

Olsson-Collentine, Anton, Marcel A. L. M. van Assen, and Chris H. J. Hartgerink. “The Prevalence of Marginally Significant Results in Psychology Over Time.” Psychological Science, February 21, 2019, 0956797619830326. https://doi.org/10.1177/0956797619830326.

Open Science Collaboration. “Estimating the Reproducibility of Psychological Science.” Science 349, no. 6251 (2015): aac4716. https://doi.org/10.1126/science.aac4716.

Stel, Mariëlle, Anna E. van ’t Veer, and Chris H. J. Hartgerink. “Lying, Intentionality Of.” In Encyclopedia of Deception. SAGE Publications, Inc., 2014. https://doi.org/10.4135/9781483306902.

Tennant, Jonathan, Bruce Becker, Tanja de Bie, et al. “What Collaboration Means to Us: We Are More Powerful When We Work Together as a Community to Solve Problems.” Collaborative Librarianship 11, no. 2 (2019). https://digitalcommons.du.edu/collaborativelibrarianship/vol11/iss2/2.

Tennant, Jonathan P., Waldner, Francois, Jacques, Damien C., Masuzzo, Paola, Collister, Lauren B., and Chris H. J. Hartgerink. “The Academic, Economic and Societal Impacts of Open Access: An Evidence-Based Review - F1000Research.” F1000Research, ahead of print, 2016. https://doi.org/10.12688/f1000research.8460.3.

Veldkamp, Coosje L. S., Chris H. J. Hartgerink, Marcel A. L. M. van Assen, and Jelte M. Wicherts. “Who Believes in the Storybook Image of the Scientist?” Accountability in Research 24, no. 3 (2017): 127–51. https://doi.org/10.1080/08989621.2016.1268922.