Groundhog was funded by the Wharton School of the University of Pennsylvania.
Like AsPredicted and ResearchBox, groundhog is brought to you by the Wharton Credibility Lab.
Uri Simonsohn (.htm) wrote the first version of groundhog and then collaborated with Hugo Gruson, an evolutionary biologist (htm), to refine it, improve it, and turn it into a CRAN package. Uri is the maintainer of the package for CRAN.

After its first release, users have provided useful suggestions and identified the issues listed in the troubleshooting page. We thank Dorothy Bishop, Mario Niepel, Diego Reinero, and Johann Jacoby.