User:DarTar/John Riedl

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This was a draft for a blog post that has since been posted at

Researching collaboration for a better world: John T. Riedl (1962 – 2013)[edit]

Does it matter that women are mostly not editing the most important information resource in our world? Does it matter that one of the most important artifacts in human history tends to be written mostly by males? […] That seems to me really important, and the question for this community, for people with our skills, is: what can we do about it? We know how to redesign socio-technical communities so that they work differently: what would be a Wikipedia that was more welcoming, that worked better for women?

— John Riedl, Community, Cooperation, and Conflict in Wikipedia, talk at UC Irvine, March 2, 2012
File:John T. Riedl crop.jpg
John Riedl in 2010

A year ago, at a lecture given at UC Irvine, computer scientist John Riedl urged students and researchers not to remain passive scholars of online collaboration, but to "design tools to directly change how the world works". At the time when he gave this advice, John was already years into a long fight with cancer. He died this past Monday, leaving among his legacy one of the most important bodies of research on Wikipedia, and inspiring a generation of computer and social scientists to think of software design as a way to build better social systems.

With his students and collaborators at GroupLens Research – the group that he co-founded at the University of Minnesota in the 1990s – John made enormous contributions to our understanding of Wikipedia, studying among other things:

  • How to recommend relevant work to Wikipedia editors (a project which resulted in the development of SuggestBot, a tool still widely used by our community, Cosley et al. 2007)
  • The survival of individual contributions and the exposure of temporarily vandalized articles to readers (Priedhorsky et al. 2007)
  • How article creation and article deletion have evolved over the years as a result of Wikipedia's growth in topic coverage and policies (Lam and Riedl 2009)
  • How Wikiprojects function, and how the diversity of their membership affects group productivity and member retention (Chen et al. 2010)
  • The impact of quality control mechanisms (such as reverts) on new contributors, the quality of their work and their survival (Halfaker et al. 2011)
  • Wikipedia's gender gap, providing the first quantitative evidence of its impact on Wikipedia's content, in a paper that received the "Best Full Paper" award at the WikiSym 2011 conference. Just last week, it was prominently cited in a strategy presentation here at the Wikimedia Foundation, by deputy director Erik Möller. (Lam et al. 2011)

John believed in Wikipedia research as a way to improve the quality and sustainability of our projects. And as a member of the Wikimedia Research Committee he also actively participated in discussions to develop policies and incentives to promote research of relevance to our volunteer communities.

He was an editor on the English Wikipedia himself, with over 100 edits since signing up in 2005. In one of his last Wikipedia edits, John added well-cited information about promising new therapies to the article about Melanoma, the form of cancer from which he was suffering. One of his former students recalls that "he’s fought it as hard as he could, with as much knowledge as he could seek." As with his own research, he shared this knowledge with others.

We wish to remember John for his relentless intellectual curiosity and extraordinary kindness and humanity, which made him an invaluable collaborator, mentor and friend. We owe to John much of what we know about our projects and we are immensely grateful to him for laying the groundwork for so many of us at the Wikimedia Foundation.

Dario Taraborelli
Senior Research Analyst