1. 1 Rolf Nevanlinna Prize Opening Ceremony International Congress of Mathematicians Madrid, Spain August 22, 2006

2. 2 The Rolf Nevanlinna Prize is awarded by the International Mathematical Union for outstanding contributions in mathematical aspects of information sciences The Rolf Nevanlinna Prize is awarded by the International Mathematical Union for outstanding contributions in mathematical aspects of information sciences First awarded in 1982 First awarded in 1982 The winner’s 40 th birthday must occur on or after January 1, 2006 The winner’s 40 th birthday must occur on or after January 1, 2006

3. 3 Nevanlinna Prize Committee Samson Abramsky (United Kingdom) Samson Abramsky (United Kingdom) Franco Brezzi (Italy) Franco Brezzi (Italy) Gert-Martin (Germany) Gert-Martin Greuel (Germany) Johan Håstad (Sweden) Johan Håstad (Sweden) Margaret Wright (USA, chair) Margaret Wright (USA, chair) Appointed by the IMU Executive Committee

4. 4 The International Mathematical Union awards the 2006 Rolf Nevanlinna Prize to Professor Jon M. Kleinberg Computer Science Department Cornell University New York, USA Date of birth: October 1971

5. 5 The Nevanlinna Prize citation For deep, creative and insightful contributions to the mathematical theory of the global information environment, including the influential “hubs and authorities” algorithm; the influential “hubs and authorities” algorithm; methods for discovering short chains in large social networks; methods for discovering short chains in large social networks; techniques for modeling, identifying and analyzing bursts in data streams; techniques for modeling, identifying and analyzing bursts in data streams; theoretical models of community growth in social networks; and theoretical models of community growth in social networks; and contributions to the mathematical theory of clustering. contributions to the mathematical theory of clustering.

6. 6 Photo credit: Michael Okoniewski for the MacArthur Foundation Jon Kleinberg

7. 7 More on Jon Kleinberg’s work Kleinberg’s combination of mathematical ability, superb taste in interesting problems, breadth of interests, and sense of strategy is both dazzling and unmatched. His work has had a fundamental impact on the effectiveness of today’s most advanced Web search engines, and his mathematical insights have had application to Internet routing, data mining, discrete optimization, and the sociology of the Web. Kleinberg’s combination of mathematical ability, superb taste in interesting problems, breadth of interests, and sense of strategy is both dazzling and unmatched. His work has had a fundamental impact on the effectiveness of today’s most advanced Web search engines, and his mathematical insights have had application to Internet routing, data mining, discrete optimization, and the sociology of the Web.