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Abraham Lempel

Abraham Lempel in 2007
Born Lvov, Poland
Residence  Israel
Fields Information theory
Institutions Technion - Israel Institute of Technology
Known for LZ77, LZ78
Notable awards 2007 IEEE Richard W. Hamming Medal

Abraham Lempel (Hebrew: אברהם למפל‎, born 10 February 1936 in Lvov, Poland[1]) is an Israeli computer scientist and one of the fathers of the LZ family of lossless data compression algorithms.

He studied at Technion - Israel Institute of Technology, and received B.Sc. in 1963, M.Sc. in 1965, and D.Sc. in 1967. Since 1977 he has held the title of full professor. He 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). This work was co-authored by Jacob Ziv. He has been named the recipient of the 2007 IEEE Richard W. Hamming Medal "For pioneering work in data compression, especially the Lempel-Ziv algorithm."

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Works

The following algorithms are named after Lempel:

The terms LZX, LHA (LHarc) and LZH do reference Lempel as well.

His works laid the basis for such compressed graphics formats as GIF, TIFF and PNG.

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

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