PFF. 50 drunk Irishmen.
PFF was founded by Neil Hornsby in the United Kingdom. Dissatisfied with some limitations of standard statistics, Hornsby began grading players in 2004. The staff gradually expanded over the next few years, and the site was launched in 2007. The 2006 NFL season was the first season for which PFF has compiled a complete set of data.
In 2014, sports commentator and former NFL player Cris Collinsworth bought a majority interest in the service.
Collinsworth and NBC is what got PFF to it's perceived credibility.