John M. Cioffi | |
|---|---|
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| Born | (1956-11-07)November 7, 1956 (age 68) Illinois, U.S. |
| Alma mater | Stanford University (PhD) University of Illinois at Urbana–Champaign (BSEE) |
| Known for | Digital subscriber line |
| Awards | Marconi Prize(2006) IEEE Alexander Graham Bell Medal (2010) IET J J Thomson Medal (2000) FREng NAE |
| Scientific career | |
| Fields | Digital communications Coding theory |
| Institutions | Stanford University |
| Doctoral advisor | Thomas Kailath |
| Doctoral students | Peter Sienpin Chow Inkyu Lee |
John Mathew Cioffi (born November 7, 1956) is an American electrical engineer, educator and inventor who has made contributions in telecommunication system theory, specifically in coding theory and information theory. Best known as "the father of DSL,"[1] Cioffi's pioneering research was instrumental in makingdigital subscriber line (DSL) technology practical and has led to over 400 publications and more than 100 pending or issued patents, many of which are licensed.
John Cioffi was born and raised inIllinois. He earned a B.S.E.E. degree from theUniversity of Illinois at Urbana–Champaign in 1978.
From 1978 to 1982, Cioffi worked as a modem designer atBell Laboratories in New Jersey. While at Bell Laboratories, he also attendedStanford University, where he earned a Ph.D. degree in Electrical Engineering in 1984, under the supervision ofThomas Kailath.
In 1984, Cioffi left Bell Labs to work atIBM as ahard disk driveread channel researcher.
In 1986, Cioffi began his teaching career as an assistant professor of electrical engineering at Stanford University. Cioffi supervised the Ph.D. programs of more than 70 students over the course of more than two decades.[2] His and his students' research intodiscrete multitone modulation (DMT) became widely adopted indigital subscriber line (DSL) technology, used commonly forInternet access.
In 1991, at the age of 35, Cioffi took a leave of absence from Stanford to found Amati Communications Corporation. His vision was to build DSL modems based on his and his students' research. Many of Cioffi's then-current and former students followed him to Amati, where they built the Prelude modem, a DSL modem that could transmit 6+ megabits per second over 9,000 ft (2,700 m) oftelephone line. The Prelude modem would go on to win what has become known as the "Bellcore ADSL Olympics" in 1993 by performing significantly better than modems using single-carrier modulation techniques, such asquadrature amplitude modulation (QAM) andcarrierless amplitude phase modulation (CAP), including modems fromAT&T andBellcore.[3] Hundreds of millions of people now use DSL based on Amati's innovations.
In 1993, Cioffi returned to Stanford, although he remained involved with Amati as an officer and director until its 1998 acquisition byTexas Instruments.[4] Cioffi's research interests then turned todynamic spectrum management (DSM), an improvement on DSL that mitigates service interruptions and allows DSL lines to run with higher and more reliable data rates.
In 2001, Cioffi was elected as a member into theNational Academy of Engineering for contributions to the theory and practice of high-speed digital communications.
In 2003, Cioffi founded Adaptive Spectrum and Signal Alignment, Inc. (ASSIA) to help service providers realize improvements in the performance and profitability of their DSL networks. Today ASSIA's customers collectively provide DSL service to more than 70 million subscribers worldwide.[5]
In 2009, Cioffi assumedemeritus status at Stanford, as the Hitachi Professor Emeritus of Engineering.[2] He is now CEO and Chairman of ASSIA.
Cioffi has received numerous awards and honors. Among them are:
Media related toJohn Cioffi at Wikimedia Commons
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