George Varghese

From Wikipedia, the free encyclopedia

George Varghese (born 1960) is a Principal Researcher at Microsoft Research. Before joining MSR's lab in Silicon Valley in 2013, he was a Professor of Computer Science at the University of California San Diego, where he led the Internet Algorithms Lab and also worked with the Center for Network Systems and the Center for Internet Epidemiology.[1] He is the author of the textbook Network Algorithmics, published by Morgan Kaufmann[2] in 2004.


Varghese received his B.Tech in electrical engineering from IIT Bombay in 1981, his M.S. in computer studies from NCSU in 1983 and his Ph.D. in computer science from MIT in 1993, where his advisor was Nancy Lynch.[3] He has been a Fellow of the ACM since 2002.[4]


Transparent Bridge Architecture[edit]

Before his Ph.D., George spent several years as part of the network architecture and advanced development group at Digital Equipment Corporation, where he wrote the first specification for the first transparent bridge architecture (based on the inventions of Mark Kempf and Radia Perlman).[citation needed] After several iterations and other authors, this became the IEEE 802 bridge specification, a widely implemented standard that is the basis of the billion dollar transparent bridging industry{{According to whom}}.[citation needed] He was also part of the DEC team that invented the Gigaswitch and the Giganet (a precursor to Gigabit Ethernet).[citation needed]

Network Algorithmics[edit]

Varghese is best known for helping define network algorithmics, a field of study which resolves networking bottlenecks using interdisciplinary techniques that include changes to hardware and operating systems as well as efficient algorithms.[citation needed]

His contributions to network algorithmics include Deficit Round Robin (co-invented with M. Shreedhar), a scheduling algorithm that is widely used in routers, and timing wheels (with Tony Lauck), an algorithm for fast timers that is used as the basis of fast timers in Linux and FreeBSD.[citation needed]

IP lookup and packet classification[edit]

Varghese has also worked extensively on fast IP lookup and packet classification. His work with G. Chandranmenon on Threaded indexes predates the work done at Cisco Systems and Juniper Networks on tag switching[citation needed]. His work on multibit tries (with V. Srinivasan) has been used by a number of companies including Microsoft. His work on scalable IP packet lookup (with Waldvogel and Turner) for longer addresses such as IPv6 is being considered for use by Linux.[citation needed]

George also worked with Eatherton and Dittia on the Tree bitmap IP lookup algorithm that is used in Cisco's CRS-1 router, which many[who?] believe to be the fastest router in the world[citation needed]. Tree bitmap and hypercuts (with Sumeet Singh and Florin Baboescu) appear to be among the best algorithms (excluding CAMs) for IP lookup and packet classification today.[citation needed]

Self stabilization[edit]

George is also known for his contributions to the theoretical field of self-stabilization (a form of fault-tolerance), where he has helped (with various colleagues) pioneer several general techniques such as local checking, local correction, and counter flushing.[citation needed]


Varghese co-founded NetSift Inc. (with Sumeet Singh) in 2004, serving as president and CTO. NetSift helped pioneer the notion of automated signature extraction for security and helped to introduce the use of streaming algorithms for network measurement and security at speeds greater than 10 Gbit/s. His work with Cristian Estan on multistage filters has been widely used in industry. NetSift was acquired in June 2005 by Cisco Systems as part of the Modular Switching Group.[citation needed]

Awards and honors[edit]

  • Elected as a member into the National Academy of Engineering, 2017[5]
  • 2014 Koji Kobayashi Award for Computers and Communications for "Contributions to the field of network algorithmics and its applications to high-speed packet networks"
  • ACM Fellow, 2002
  • Best Teacher Award in Computer Science, UCSD, 2001, voted by graduating undergraduate students
  • Best Tutorial Award, SIGMETRICS 98.
  • Big Fish, Mentor of the Year Award, Association for Graduate Engineering Students (AGES), Washington University 1997.
  • ONR Young Investigator Award 1996 (34 awarded out of 416 applications across the sciences, among 2 computer scientists chosen in 1996)
  • Best Student Paper, PODC 96, for a paper jointly written with student Mahesh Jayaram.
  • Joint winner of the Sproull Prize for best MIT Thesis in Computer Science (1993) and nominated by MIT for ACM Thesis Prize.
  • DEC Graduate Education Program (GEEP) Scholar, 1989–1991.

Selected publications[edit]


  1. ^ Dame, Marketing Communications: Web | University of Notre. "George Varghese". NSF Workshop. Retrieved 2022-10-17.
  2. ^ "Network Algorithmics:An Interdisciplinary Approach to Designing Fast Networked Devices". Elsevier: Morgan Kaufmann. Archived from the original on 2011-07-10. Retrieved December 22, 2006.
  3. ^ George Varghese at the Mathematics Genealogy Project
  4. ^ "George Varghese – Award Winner". Association for Computing Machinery. Retrieved 31 October 2013.
  5. ^ National Academy of Engineering Elects 84 Members and 22 Foreign Members, February 8, 2017, retrieved 2017-05-02.

External links[edit]