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From Wikipedia, the free encyclopedia
Robert Endre Tarjan (born April 30, 1948) is an American mathematician. He is the discoverer of several graph algorithms, including Tarjan's off-line least common ancestors algorithm, and co-inventor of both splay trees and Fibonacci heaps. Tarjan is currently the James S. McDonnell Distinguished University Professor of Computer Science at Princeton University, and is also a Senior Fellow at Hewlett-Packard. [1 ]
Early life and education [ edit ]
He was born in
Pomona, California. His father was a child psychiatrist specializing in mental retardation, and ran a state hospital. As a child, Tarjan read a lot of science fiction, and wanted to be an [2 ] astronomer. He became interested in mathematics after reading Martin Gardner's mathematical games column in Scientific American. He became seriously interested in math in the eighth grade, thanks to a "very stimulating" teacher. [3 ]
While he was in high school, Tarjan got a job, where he worked IBM card punch collators. He first worked with real computers while studying astronomy at the
Summer Science Program in 1964. [2 ]
Tarjan obtained a
Bachelor's degree in mathematics from the California Institute of Technology in 1969. At Stanford University, he received his Master's degree in computer science in 1971 and a Ph.D. in computer science (with a minor in mathematics) in 1972. At Stanford, he was supervised by Robert Floyd and [4 ] Donald Knuth, both highly prominent computer scientists, and his Ph.D. dissertation was [5 ] An Efficient Planarity Algorithm. Tarjan selected computer science as his area of interest because he believed that CS was a way of doing mathematics that could have a practical impact. [6 ]
Computer science career [ edit ]
Tarjan has been teaching at Princeton University since 1985.
He has also held academic positions at Cornell University (1972–73), University of California, Berkeley (1973–1975), Stanford University (1974–1980), and New York University (1981–1985). He has also been a fellow of the NEC Research Institute (1989–1997). [6 ] In April 2013 he joined Microsoft Research Silicon Valley in addition to the position at Princeton. [7 ]
Tarjan has worked at AT&T Bell Labs (1980–1989), InterTrust Technologies (1997–2001), Compaq (2002) and Hewlett Packard (2006–present).
Algorithms and data structures [ edit ]
Tarjan is known for his pioneering work on graph theory algorithms and data structures. Some of his well-known algorithms include
Tarjan's off-line least common ancestors algorithm, and Tarjan's strongly connected components algorithm, and he was one of five co-authors of the median of medians linear time selection algorithm. The Hopcroft-Tarjan planarity testing algorithm was the first linear-time algorithm for planarity-testing. [8 ]
Tarjan has also developed important data structures such as the
Fibonacci heap (a heap data structure consisting of a forest of trees), and the splay tree (a self-adjusting binary search tree; co-invented by Tarjan and Daniel Sleator). Another significant contribution was the analysis of the disjoint-set data structure; he was the first to prove the optimal runtime involving the inverse Ackermann function.
Tarjan received the
Turing Award jointly with John Hopcroft in 1986. The citation for the award states that it was: [7 ]
For fundamental achievements in the design and analysis of algorithms and data structures.
Tarjan was also elected an
ACM Fellow in 1994. The citation for this award states: [9 ]
For seminal advances in the design and analysis of data structures and algorithms.
Some of the other awards for Tarjan include:
^ "HP Fellows: Robert Endre Tarjan". Hewlett-Packard . Retrieved 2008-01-09.
^ a b Shasha, Dennis Elliott; Lazere, Cathy A. (1998) . "Robert E. Tarjan: In Search of Good Structure". Out of Their Minds: The Lives and Discoveries of 15 Great Computer Scientists. Copernicus/Springer. pp. 102–119. ISBN 978-0-387-97992-2. OCLC 32240355.
^ "Robert Tarjan: The Art of the Algorithm". Hewlett-Packard . Retrieved 2010-09-05.
^ "Robert Endre Tarjan". Mathematics Genealogy Project . Retrieved 2008-01-09.
^ Robert, Tarjan. "Curriculum Vitae".
^ a b "Robert Endre Tarjan: The art of the algorithm (interview)". Hewlett-Packard. September 2004 . Retrieved 2008-01-09.
^ a b c d e f Turing award citation, ACM, retrieved 2014-01-19.
^ Kocay, William; Kreher, Donald L (2005). "Planar Graphs". Graphs, algorithms, and optimization. Boca Raton: Chapman & Hall/CRC. p. 312. ISBN 978-1-58488-396-8. OCLC 56319851.
^ Nevanlinna prize winners, International Mathematical Union, retrieved 2014-01-19.
References [ edit ]
External links [ edit ]
Adleman, Diffie, Hellman, Merkle, Rivest, Shamir (1996)
Lempel, Ziv (1997)
Bryant, Clarke, Emerson, McMillan (1998)
Sleator, Tarjan (1999)
Miller, Rabin, Solovay, Strassen (2003)
Freund, Schapire (2004)
Holzmann, Kurshan, Vardi, Wolper (2005)
Cortes, Vapnik (2008)
Bellare, Rogaway (2009)
Broder, Charikar, Indyk (2012)
Blumofe, Leiserson (2013)