There is an account on twitter named @jonnygrossmark, who has been peppering anybody who said something nice about the Crystal Ball article published yesterday that I stole his work.

For reference, here is my piece, and here is a link to the piece that he said includes work I stole.

In his mind, the section that discusses how teams that give up 16 shots or more defensively is the exact same as what he wrote in that piece back in March. My research came about naturally as part of doing historic relegation research, and had nothing to do with Mr. Grossmark.

This is not the first time Mr. Grossmark has accused myself or a member of StatsBomb of “stealing his work.” He did it with regard to original research Benjamin Puglsey published this spring, and with regard to a piece I wrote for Squawka looking at Shots on Target Conceded data. In fact, nearly every time a member of the site writes about shots on target information, he claims to have already written the information somewhere else and that we are engaging in plagiarism.

I blocked Jonny some time ago from my own account and from the StatsBomb account, and Ben has also blocked him in the past, after trying to engage and explain that obviously we happen to write about stats, and sometimes research overlaps. That said, the nature of the pestering and abuse has reached a level that I felt I needed to address it.

I do not and have not read anything Jonny Grossmark has printed in the past unless he explicitly said it was something we had stolen, which would obviously happen after we published. I have never stolen, plagiarized, or even taken inspiration from his work. Nor has anyone involved with this site.

Additionally, if you look through the pieces I publish as well as what I produce on my Twitter account, you see consistent citations and discussion of the works of other analysts in the media and the stats community. I try to go out of my way to bring attention to good writing and analysis because I want other people doing good work to succeed, and I want to pay back some of the publicity that people gave me when I was starting out, at least as much as an account with 4000 followers or so can.

There are a lot of excellent analysts out there working with the same data and reaching similar conclusions. That’s how statistical research usually goes. Then there’s Jonny Grossmark, trying to claim every time a particular subset of stats is written about, the work is his.

In the future, if Mr. Grossmark should falsely accuse anyone else of stealing his work, feel free to reply to the accusation with a link to this post, and educate whomever he happens to be pestering this week on the extent of his previous reputation.






  • Richard

    Grossmark is the biggest fool I’ve ever come across on twitter. He is convinced there is a bookmaker conspiracy to silence his ideas. He apparently wondered around the streets of London trying to track down people that criticized him online. He also threatened legal action against me because I constructively scrutinized one of his articles. The man, frankly, seems to be complete lunatic.

    • Hejik

      I’d have to concur with Richard above having unfortunately been on the receiving end of one of Jonny’s “episodes” yesterday.

      A harmless suggestion that he was really just back-fitting ideas to make them workable resulted in first accusations that I was a “betting syndicate trying to silence his great essays” swiftly followed by a relentless, 8 hour, 300 tweet barrage of abuse culminating in him threatening to report me to the police if I dared to question him again and then only seconds later tweeting @metpoliceuk asking them to have a “quiet word with me”

      How anybody can take him seriously in this field is beyond me

      • Hejik

        The ultimate irony in all of this is he’s recently been copy/pasting my work and posting it word-for-word on his blog without even a note of credit.

        After his ceaseless protestations about a non-issue, as highlighted here, I find that rather rich!

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