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John Leroy Hennessy (born 22 September, 1952) is an American computer scientist and chairman of Alphabet Inc.[8] Hennessy is one of the founders of MIPS Technologies and Atheros, serving as 10th president of Stanford University from 2000 to 2016. He was succeeded as president by Marc Tessier-Lavigne.[9] Marc Andreessen called him "the godfather of Silicon Valley."[10]
Along with David Patterson, Hennessy was a recipient of the 2017 Turing Award for their work in developing the reduced instruction set computer (RISC) architecture, which is now used in 99% of new computer chips.[11][12][13][14][15][16][17]
Early life and education
[edit]Hennessy was raised in Huntington, New York, as one of six children.[10] His father was an aerospace engineer, and his mother was a teacher before raising her children.[10] He is of Irish-Catholic descent, with some of his ancestors arriving in America during the potato famine in the 19th century.[18]
He earned his bachelor's degree in electrical engineering from Villanova University, and his master's degree and Doctor of Philosophy in computer science from Stony Brook University.[6][19][20]
Career and research
[edit]Hennessy became a Stanford faculty member in 1977. In 1981, he began the MIPS project to investigate RISC processors, and in 1984, he used his sabbatical year to found MIPS Computer Systems Inc. to commercialize the technology developed by his research. In 1987, he became the Willard and Inez Kerr Bell Endowed Professor of Electrical Engineering and Computer Science.[20]
Hennessy was director of Stanford's Computer System Laboratory (1989–93), a research center run by Stanford's Electrical Engineering and Computer Science departments. He was chair of the Department of Computer Science (1994–96) and Dean of the School of Engineering (1996–99).[20]
In 1999, Stanford President Gerhard Casper appointed Hennessy to succeed Condoleezza Rice as Provost of Stanford University. When Casper stepped down to focus on teaching in 2000, the Stanford Board of Trustees named Hennessy to succeed Casper as president. In 2008, Hennessy earned a salary of $1,091,589 ($702,771 base salary, $259,592 deferred benefits, $129,226 non-tax benefits), the 23rd highest among all American university presidents.[21]
Hennessy has been a board member of Google (later Alphabet Inc.),[22] Cisco Systems,[23] Atheros Communications,[24] and the Gordon and Betty Moore Foundation.[25] He was elected to the American Philosophical Society in 2008.[26]
On October 14, 2010, Hennessy was presented a khata by the 14th Dalai Lama before the latter addressed Maples Pavilion.[27]
In December 2010, Hennessy coauthored an editorial with Harvard University President Drew Gilpin Faust urging the passage of the DREAM Act;[28] the legislation did not pass the 111th United States Congress.
In 2013, Hennessy became a judge for the inaugural Queen Elizabeth Prize for Engineering. He has remained on the judging panel for the subsequent awards in 2015 and 2017.
In June 2015, Hennessy announced that he would step down as Stanford president in summer 2016.[29]
In 2016, Hennessy co-founded the Knight-Hennessy Scholars program; he serves as its inaugural director. The program has a $750 million endowment to fully fund graduate students at Stanford for up to three years.[30][31] The inaugural class of 51 scholars from 21 countries arrived at Stanford in the fall of 2018.[32]
In February 2018, Hennessy was announced as the new Chairman of Alphabet Inc., Google's parent company.[33]
Hennessy has a history of strong interest and involvement in college-level computer education. He co-authored, with David Patterson, two well-known books on computer architecture, Computer Organization and Design: the Hardware/Software Interface and Computer Architecture: A Quantitative Approach,[5] which introduced the DLX RISC architecture. They have been widely used as textbooks for graduate and undergraduate courses since 1990.[34]
Hennessy also contributed to updating Donald Knuth's MIX processor to the MMIX. Both are model computers used in Knuth's classic series, The Art of Computer Programming. MMIX is Knuth's DLX equivalent.
Awards and honors
[edit]- Elected to the National Academy of Engineering:[35] 1992 For innovations in computer architecture and software techniques for reduced instruction set computers (RISC), and for quantitative evaluation methods for modern computer architectures.
- IEEE Emanuel R. Piore Award – [36]
1994 "For contributions to quantitative evaluation of computer architectures and the successful implementation of Reduced Instruction-Set Computer (RISC) architecture." - Fellow of the Association for Computing Machinery (ACM)
1997 - Golden Plate Award of the American Academy of Achievement – [37][38]
2001 - Association for Computing Machinery SIGARCH ISCA Influential Paper Award – [39][40]
2004 1989 co-authored paper on high performing cache hierarchies - Fellow of the Computer History Museum – [41]
2007 "for fundamental contributions to engineering education, advances in computer architecture, and the integration of leading-edge research with education"
- IEEE Medal of Honor – [42][43]
2012 "for pioneering the RISC processor architecture and for leadership in computer engineering and higher education" - Honorary Degree in Mathematics, University of Waterloo
2012 "for profound contributions to modern computer architecture and to post-secondary education" - Fellow of the Royal Academy of Engineering, (FREng) UK – [44]
2017 - Turing Award – [45]
2017 "for pioneering a systematic, quantitative approach to the design and evaluation of computer architectures with enduring impact on the microprocessor industry" - BBVA Foundation Frontiers of Knowledge Award 2020 in Information and Communication Technologies.[46]
- In 2020, he received from the UC Berkeley Academic Senate the Clark Kerr Award for distinguished leadership in higher education.[47]
- In 2022, he was awarded the Charles Stark Draper Prize by the National Academy of Engineering alongside Steve Furber, David Patterson and Sophie Wilson for contributions to the invention, development, and implementation of reduced instruction set computer (RISC) chips.[48][49]
Selected publications
[edit]- Computer Architecture: A Quantitative Approach[5]
- Patterson, David A.; Hennessy, John L. (1994). Computer Organization and Design: The Hardware/Software Interface. Morgan Kaufmann. ISBN 978-0-12-370606-5.
- Gharachorloo, Kourosh; D. Lenoski; J. Laudon; P. Gibbons; A. Gupta; J. Hennessy (1990). "Memory consistency and event ordering in scalable shared-memory multiprocessors". Proceedings of the 17th annual international symposium on Computer Architecture. International Symposium on Computer Architecture. pp. 15–26.
- Lenoski, Daniel; J. Laudon; K. Gharachorloo; A. Gupta; J. Hennessy (1990). "The directory-based cache coherence protocol for the DASH multiprocessor". Proceedings of the 17th annual international symposium on Computer Architecture. International Symposium on Computer Architecture. pp. 148–159.
Personal life
[edit]Hennessy is married to Andrea Berti, whom he met in high school.[10]
References
[edit]- ^ Robinson, James (April 5, 2000). "Provost John L. Hennessy named Stanford's 10th president". Stanford News. Retrieved December 1, 2023.
- ^ Lapin, Lisa (June 21, 2016). "Stanford President-elect Marc Tessier-Lavigne is preparing to take office Sept. 1". Stanford News. Retrieved December 1, 2023.
- ^ "John L. Hennessy, Stanford University". nasonline.org.
- ^ "John Hennessy". acm.org.
- ^ a b c Patterson, David; Hennessy, John H.; Arpaci-Dusseau, Andrea C. (2007). Computer architecture: a quantitative approach. San Diego: Morgan Kaufmann. ISBN 978-0-12-370490-0.
- ^ a b c d John L. Hennessy at the Mathematics Genealogy Project
- ^ Paulson, Lawrence Charles (1981). A Compiler Generator for Semantic Grammars (PhD thesis). Stanford University. OCLC 757240716. ProQuest 303229537.
- ^ Haselton, Todd (2025-08-14). "John Hennessy named as Alphabet's new board chairman". CNBC. Retrieved 2025-08-14.
- ^ "Stanford University President John L. Hennessy to step down in 2016". Stanford News. 2025-08-14. Retrieved 2025-08-14.
- ^ a b c d Auletta, Ken (April 30, 2012). "Get Rich U." The New Yorker. Archived from the original on 25 March 2013. Retrieved 6 April 2013.
- ^ "Computer Chip Visionaries Win Turing Award". The New York Times. 2025-08-14.
- ^ John L. Hennessy, Stanford Website
- ^ The Secret of Silicon Valley, John Hennessy speaks at Stanford
- ^ Interview with John Hennessy
- ^ Interview with John Hennessy, concerning the video game industry (audio and text) - 2025-08-14
- ^ John L. Hennessey Papers
- ^ John Hennessy's higher learning, strategy+business interview (2019)
- ^ University, ? Stanford; Stanford; California 94305. "John Hennessy : An Oral History". purl.stanford.edu. Retrieved 2025-08-14.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^ Hennessy, John Leroy (1977). A real-time language for small processors: design, definition, and implementation (PhD thesis). State University of New York at Stony Brook. OCLC 31799595. ProQuest 302854127.
- ^ a b c "Curriculum Vitae". Office of the President. Archived from the original on October 24, 2012. Retrieved April 26, 2011.
- ^ "Million-Dollar College Presidents". The Daily Beast. November 14, 2010. Retrieved April 26, 2011.
- ^ "Board of Directors". Google Investor Relations. Retrieved June 14, 2012.
- ^ "Governing Board". Cisco Systems. Archived from the original on 2025-08-14. Retrieved 2025-08-14.
- ^ "Governing Board". Atheros Communications. Archived from the original on 2025-08-14. Retrieved 2025-08-14.
- ^ "Board of Trustees". Gordon and Betty Moore Foundation.
- ^ "APS Member History". search.amphilsoc.org. Retrieved 2025-08-14.
- ^ "President Hennessy salutes the Dalai Lama, and is honored in return". Stanford University Report. October 14, 2010. Retrieved April 26, 2011.
- ^ "Deserving of the DREAM". Politico. December 8, 2010. Retrieved April 26, 2011.
- ^ "Stanford University President John L. Hennessy to step down in 2016". 2025-08-14.
- ^ Frequently Asked Questions | Knight-Hennessy Scholars Archived 2025-08-14 at the Wayback Machine Stanford, Retrieved 15 August 2016
- ^ Amini, Mariam (2025-08-14). "Alphabet's John Hennessy talks about helping international students with scholarships". CNBC. Retrieved 13 August 2018.
- ^ Chang, Annie (16 Feb 2018). "Inaugural Knight-Hennessy Scholars selected". The Stanford Daily.
- ^ "Alphabet Names New Executive Chairman to Replace Eric Schmidt". Fortune. Retrieved 2025-08-14.
- ^ "John Hennessy and David Patterson win the Frontiers of Knowledge Award in ICT". EurekAlert!. Retrieved 2025-08-14.
- ^ "Dr. John L. Hennessy". NAE Website. 2025-08-14. Retrieved 2025-08-14.
- ^ "IEEE Emanuel R. Piore Award Recipients" (PDF). IEEE. Archived from the original (PDF) on November 24, 2010. Retrieved March 20, 2021.
- ^ "Golden Plate Awardees of the American Academy of Achievement". achievement.org. American Academy of Achievement.
- ^ "Jeffrey P. Bezos Biography Photo". 2001.
A discussion on the future of technology at the 2001 Summit. Bezos is joined by Bell Labs President Dr. Jeong Kim, Microsoft's Dr. Charles Simonyi, Stanford President Dr. John L. Hennessy, and tech entrepreneur Dr. Kenan Sahin.
- ^ Przybylski, S.; Horowitz, M.; Hennessy, J. (1989). "Characteristics of performance-optimal multi-level cache hierarchies". ACM SIGARCH Computer Architecture News. 17 (3): 114–121. doi:10.1145/74926.74939.
- ^ Kuskin, J.; Horowitz, M.; Gupta, A.; Rosenblum, M.; Hennessy, J.; Ofelt, D.; Heinrich, M.; Heinlein, J.; Simoni, R.; Gharachorloo, K.; Chapin, J.; Nakahira, D.; Baxter, J. (1994). "The Stanford FLASH multiprocessor". ACM SIGARCH Computer Architecture News. 22 (2): 302–313. CiteSeerX 10.1.1.467.9672. doi:10.1145/192007.192056.
- ^ "John Hennessy". Computer History Museum. Archived from the original on 2025-08-14. Retrieved 2025-08-14.
- ^ "Stanford President Hennessy wins IEEE's highest honor". December 2011.
- ^ "IEEE Medal of Honor Recipients" (PDF). Institute of Electrical and Electronics Engineers (IEEE). Archived from the original (PDF) on 2025-08-14.
- ^ "John L. Hennessy elected to Royal Academy of Engineering". 2025-08-14.
- ^ "John Hennessy and David Patterson will receive the 2017 ACM A.M. Turing Award". acm.org. Retrieved 2025-08-14.
- ^ BBVA Foundation Frontiers of Knowledge Awards 2020
- ^ "History of the Clark Kerr Award | Academic Senate". academic-senate.berkeley.edu. Retrieved 2025-08-14.
- ^ "Recipients of the Charles Stark Draper Prize for Engineering". nae.edu.
- ^ "Charles Stark Draper Prize for Engineering". nae.edu.
| International | |
|---|---|
| National | |
| Academics | |
| People | |
| Other | |
- American computer scientists
- Computer designers
- 1952 births
- Living people
- American corporate directors
- Directors of Alphabet Inc.
- 1997 fellows of the Association for Computing Machinery
- Members of the United States National Academy of Engineering
- Members of the United States National Academy of Sciences
- Presidents of Stanford University
- Provosts of Stanford University
- Seymour Cray Computer Engineering Award recipients
- Stanford University Department of Electrical Engineering faculty
- Scientists from California
- Villanova University alumni
- Stony Brook University alumni
- MIPS Technologies
- 20th-century American scientists
- 21st-century American scientists
- Fellows of the IEEE
- Fellows of the American Academy of Arts and Sciences
- Turing Award laureates
- American university and college faculty deans
- Silicon Valley people
- IEEE Medal of Honor recipients