John T. Riedl

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John T. Riedl
John Riedl 2004 Chipmark Photoshoot mcassano.jpg
John Riedl in 2004
John Thomas Riedl

(1962-01-16)January 16, 1962
DiedJuly 15, 2013(2013-07-15) (aged 51)
CitizenshipUnited States
Alma mater
AwardsIEEE Fellow (2012), ACM Fellow (2010), ACM Distinguished Scientist (2007)
Scientific career
FieldsComputer Science, Human-Computer Interaction
Doctoral students

John Thomas Riedl (January 16, 1962 – July 15, 2013) was an American computer scientist and the McKnight Distinguished Professor at the University of Minnesota.[3] His published works include highly influential research on the social web, recommendation systems, and collaborative systems.[4][5][6]

Life and work[edit]

John Riedl received his B.S. in Mathematics from the University of Notre Dame in 1983 and his M.S. in Computer Science from Purdue University in 1985. He completed his Ph.D. 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.[2]

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 Ph.D. 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.[7][8]

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[9] to commercialize recommender systems research, which had "an enormous impact on e-commerce and information portals."[6] At the height of the dot-com bubble, Net Perceptions was valued at $1.5 billion and had over 300 employees,[10] but the company was liquidated in 2004.[11]

Riedl died on July 15, 2013, after a 3-year-long battle with melanoma.[12][13][14]

Honors and awards[edit]

Riedl was honored with the ACM Software System Award in 2010 for his work on recommender systems.[6] He was named an ACM Fellow in 2009 and was also named an IEEE Fellow in 2012.[5] He received numerous awards for his conference publications including best papers at CSCW, IUI, and WikiSym.[15][16][17] 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).[2]


Highly cited articles[edit]

  • 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. pp. 175–186. doi:10.1145/192844.192905. ISBN 978-0897916899. S2CID 2616594.
  • Sarwar, Badrul; Karypis, George; Konstan, Joseph; Riedl, John (2001). Item-based collaborative filtering recommendation algorithms. Proceedings of the 10th International Conference on World Wide Web. ACM. pp. 285–295. CiteSeerX doi:10.1145/371920.372071. ISBN 978-1581133486. S2CID 8047550.
  • Herlocker, Jonathan L.; Konstan, Joseph A.; Terveen, Loren G.; Riedl, John T. (2004). "Evaluating collaborative filtering recommender systems". ACM Transactions on Information Systems. 22 (1): 5–53. CiteSeerX doi:10.1145/963770.963772. S2CID 207731647.


  1. ^ Riedl, Karen (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". Retrieved 2014-03-03.
  4. ^ "Google Scholar profile". Retrieved 16 July 2013.
  5. ^ a b "2012 Newly Elevated Fellows". IEEE. 2012. Archived from the original on 23 September 2013. Retrieved 16 July 2013.
  6. ^ a b c "ACM Fellow". ACM. 2009. Retrieved 16 July 2013.
  7. ^ Henry, Devin (September 27, 2007). "Chipmark class is a real-world setting". Minnesota Daily. Retrieved August 31, 2013.
  8. ^ "Chipmark". Retrieved August 31, 2013.
  9. ^ Snyder, Steven (16 July 2013). "In Memory of John Riedl: A pioneer of recommender systems". Snyder Leadership.{{cite web}}: CS1 maint: url-status (link)
  10. ^ 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.
  11. ^ "Net Perceptions sold, will move East". Minneapolis St. Paul Business Journal. April 21, 2004. Retrieved July 16, 2013.
  12. ^ "Obituary: U's John Riedl was pioneer of recommender systems". Star Tribune. Retrieved 2021-03-14.
  13. ^ "Professor John Riedl, pioneer in recommender systems, dies". University of Minnesota. 2013. Retrieved 16 July 2013.
  14. ^ "In Memoriam: John Riedl (1962–2013) | Computer Science & Engineering". 2013-07-15. Retrieved 2015-08-24.
  15. ^ "Best of CSCW2006 Awards". ACM. Retrieved 19 July 2009.
  16. ^ "Best Paper for Riedl". Department of Computer Science & Engineering, University of Minnesota. Retrieved 19 July 2013.
  17. ^ "Best Paper winners for WikiSym 2011". WikiSym. Retrieved 19 July 2013.

Further reading[edit]

External links[edit]