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John T. Riedl

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John Thomas Riedl January 16, 1962 – July 15, 2013 was an American computer scientist and the McKnight Distinguished Professor at the University of Minnesota His published works include highly influential research on the social web, recommendation systems, and collaborative systems


  • 1 Life and work
  • 2 Honors and awards
  • 3 Publications
    • 31 Highly cited articles
  • 4 References
  • 5 Further reading
  • 6 External links

Life and work

John Riedl received his BS in Mathematics from the University of Notre Dame in 1983 and his MS in Computer Science from Purdue University in 1985 He completed his PhD in Computer Science at Purdue University in 1990 He became an Assistant Professor at the University of Minnesota in 1990 and was promoted to Associate Professor in 1996 and again to Professor in 2003

At the university, he led the GroupLens Research group In 2012 he was awarded the McKnight Distinguished Professor position During his time as a professor he advised 16 PhD students who went on to take faculty positions and work at technology companies like Google, PARC, Intel, eBay and the Wikimedia Foundation He was also the faculty advisor for a long-running project in which twelve undergraduates each year would hone their entrepreneurial and software-development skills by taking charge of the development and maintenance of Chipmark, an online bookmark-sharing service

He was a founder of the field of recommender systems, social computing, and interactive intelligent user interface systems In 1996, he co-founded Net Perceptions to commercialize the recommender systems research, which had "an enormous impact on e-commerce and information portals" At the height of the dot-com bubble, Net Perceptions was valued at $15 billion and had over 300 employees, but the company was liquidated in 2004

Riedl died on July 15, 2013 after a 3-year-long battle with melanoma

Honors and awards

Riedl was honored with the ACM Software System Award in 2010 for his work on recommender systems He was named an ACM Fellow in 2009 and was also named an IEEE Fellow in 2012 He received numerous awards for his conference publications including best papers at CSCW, IUI, and WikiSym He has also received commendations for his teaching, including the Outstanding Teacher Award at the University of Minnesota four times 1990–1993, 2010–2011 and the George Taylor Award for Exceptional Contributions to Teaching 1995–96


Highly cited articles

  • Resnick, Paul; Iacovou, Neophytos; Suchak, Mitesh; Bergstrom, Peter; Riedl, John 1994 "Grouplens: An open architecture for collaborative filtering of netnews" Proceedings of the 1994 ACM Conference on Computer Supported Cooperative Work ACM: 175–186 doi:101145/192844192905 
  • Sarwar, Badrul; Karypis, George; Konstan, Joseph; Riedl, John "Item-based collaborative filtering recommendation algorithms" Proceedings of the 10th International Conference on World Wide Web ACM: 285–295 doi:101145/371920372071 
  • Herlocker, Jonathan L; Konstan, Joseph A; Terveen, Loren G; Riedl, John T 2004 "Evaluating collaborative filtering recommender systems" ACM Transactions on Information Systems ACM 22 1: 5–53 doi:101145/963770963772 


  1. ^ Karen Riedl July 15, 2013 "A Peaceful Passing" Retrieved August 31, 2013 
  2. ^ a b c "Curricula Vitae" PDF University of Minnesota Retrieved July 16, 2013 
  3. ^ "John Thomas RIEDL Obituary: View John RIEDL's Obituary by Pioneer Press" Legacycom Retrieved 2014-03-03 
  4. ^ "Google Scholar profile" Retrieved 16 July 2013 
  5. ^ a b "2012 Newly Elevated Fellows" IEEE 2012 Retrieved 16 July 2013 
  6. ^ a b c "ACM Fellow" ACM 2009 Retrieved 16 July 2013 
  7. ^ Devin Henry September 27, 2007 "Chipmark class is a real-world setting" Minnesota Daily Retrieved August 31, 2013 
  8. ^ "Chipmark" Retrieved August 31, 2013 
  9. ^ Wieffering, Eric August 7, 2003 "Onetime Internet star calls it quits; Net Perceptions was a home-grown success story that captured national attention" Minneapolis Star Tribune 
  10. ^ "Net Perceptions sold, will move East" Minneapolis St Paul Business Journal April 21, 2004 Retrieved July 16, 2013 
  11. ^ "Professor John Riedl, pioneer in recommender systems, dies" University of Minnesota 2013 Retrieved 16 July 2013 
  12. ^ "In Memoriam: John Riedl 1962-2013 | Computer Science & Engineering" wwwcsumnedu 2013-07-15 Retrieved 2015-08-24 
  13. ^ "Best of CSCW2006 Awards" ACM Retrieved 19 July 2009 
  14. ^ "Best Paper for Riedl" Department of Computer Science & Engineering, University of Minnesota Retrieved 19 July 2013 
  15. ^ "Best Paper winners for WikiSym 2011" WikiSym Retrieved 19 July 2013 

Further reading

  • Gladwell, Malcolm 1999 "Science of a Sleeper" The New Yorker  - profile of collaborative filtering, recommendations, and Net Perceptions' recommender system
  • 2013 Profile of Riedl's work, from UMN research

External links

  • Official website
  • Personal Blog
  • In memoriam: John Riedl

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John T. Riedl

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