Abraham Lempel  

Abraham Lempel in 2007


Born  Lwów, Poland (now Lviv, Ukraine) 
10 February 1936
Residence  Israel 
Fields  Information theory 
Institutions  Technion  Israel Institute of Technology 
Known for  LZ77, LZ78 
Notable awards  Paris Kanellakis Award (1997) IEEE Richard W. Hamming Medal (2007) 
Abraham Lempel (Hebrew: אברהם למפל, born 10 February 1936) is an Israeli computer scientist and one of the fathers of the LZ family of lossless data compression algorithms.
Biography[edit]
Lempel was born on 10 February 1936 in Lwów, Poland (now Lviv, Ukraine).^{[1]} He studied at Technion  Israel Institute of Technology, and received a B.Sc. in 1963, M.Sc. in 1965, and D.Sc. in 1967. Since 1977 he has held the title of full professor. Lempel is now a professor emeritus in Technion.
His historically important works start with the presentation of the LZ77 algorithm in a paper entitled "A Universal Algorithm for Sequential Data Compression" in the IEEE Transactions on Information Theory (May 1977), coauthored by Jacob Ziv.
He is the recipient of the 1998 Golden Jubilee Award for Technological Innovation from the IEEE Information Theory Society;^{[2]} and the 2007 IEEE Richard W. Hamming Medal, for "pioneering work in data compression, especially the LempelZiv algorithm".^{[3]}
Lempel founded HP Labs—Israel in 1994, and served as its director until October 2007.
Works[edit]
The LZ77 and LZ78 algorithms authored by Lempel and Jacob Ziv have led to a number of derivative works, including the Lempel–Ziv–Welch algorithm, used in the GIF image format, and the LempelZivMarkov chain algorithm, used in the 7Zip and xz compressors. The algorithms have also been used as originally published in formats such as DEFLATE, used in the PNG image format.
Bibliography[edit]
 Jacob Ziv, Abraham Lempel (May 1977). "A Universal Algorithm for Sequential Data Compression" (PDF). IEEE Transactions on Information Theory 23 (3): 337–343. doi:10.1109/TIT.1977.1055714.
See also[edit]
References[edit]
 ^ "IEEE Transactions On Computers: Contributors". Institute of Electrical and Electronics Engineers. December 1970. Retrieved 20141030.
 ^ "Golden Jubilee Awards for Technological Innovation". IEEE Information Theory Society. Retrieved 20141030.
 ^ "IEEE Richard W. Hamming Medal Recipients" (PDF). IEEE. Retrieved 20141030.
External links[edit]
 Abraham Lempel  GHN: IEEE Global History Network
 Abraham Lempel's publications indexed by the DBLP Bibliography Server at the University of Trier
 Technion: Computer Science Department: Prof. Abraham Lempel
 Abraham Lempel: Senior HP Fellow at the Wayback Machine (archived July 6, 2008)
 Abraham Lempel at the Mathematics Genealogy Project



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