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Abraham Lempel
Abraham Lempel.JPG
Abraham Lempel in 2007
Born (1936-02-10) 10 February 1936 (age 80)
Lwów, Poland (now Lviv, Ukraine)
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.


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), co-authored 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 Lempel-Ziv algorithm".[3]

Lempel founded HP Labs—Israel in 1994, and served as its director until October 2007.


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 Lempel-Ziv-Markov chain algorithm, used in the 7-Zip and xz compressors. The algorithms have also been used as originally published in formats such as DEFLATE, used in the PNG image format.


See also[edit]


External links[edit]

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lempel ziv movie

Simple examples of encoding and decoding using the Lempel-Ziv algorithm.

Lempel ZIV Coding - To Determine The Lempel ZIV Code And To Recover The Original Sequence

In This Tutorial We Will Solve A Question Based On The Lempel ZIV Coding And Determine The Lempel ZIV Code For The Given Bit Stream And Also Recover ...

Lempel-Ziv-Welch Compression Algorithm - Tutorial

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The LZ77 Compression Family (Ep 2, Compressor Head)

The LZ77 Compression Family from the late 70s have become the most dominant dictionary encoding schemes in compression. Colt McAnlis walks us through ...

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This AV is designed to allow the student to trace and explore the behavior of the LZ77, LZ78, and LZW compression algorithms.

Animation of Lempel-Ziv Encoding Algorithm

Quoted from: http://www.data-compression.com/lempelziv.html] Encoding Algorithm Initialize the dictionary to contain all blocks of length one (D={a,b}). Search ...

Método de Compresión Lempel-Ziv

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