Lee Daniel Crocker

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Lee Daniel Crocker
Lee Daniel Crocker.JPG
Lee Daniel Crocker at Free Culture Conference, 2008
Lee Daniel Crocker

(1963-07-03) July 3, 1963 (age 59)
Valdosta, Georgia, United States
OccupationComputer Programmer
Lee Daniel Crocker at Internet Archive, 2008

Lee Daniel Crocker (born July 3, 1963) is an American computer programmer. He is best known for rewriting the software upon which Wikipedia runs, to address scalability problems. This software, originally known as "Phase III", went live in July 2002 and became the foundation of what is now called MediaWiki. MediaWiki's code repository was still named "phase3" until the move from Subversion to Git in March 2012.

He is a co-author of the PNG specification, and was also involved in the creation of the GIF and JPEG image file formats. He invented the per-scanline variable pre-filtering compression method used by PNG, the sum-of-abs heuristic used by many encoding programs,[1] and proposed an early version of the Adam7 algorithm, using 5 passes rather than 7.[citation needed] In 1998, he was one of the 23 original creators of the "Transhumanist Declaration".[2] As of 1999, he was a member of the Extropians futurist society.[3]

In June 2010, Crocker and others won the USENIX Advanced Computing Technical Association STUG award for contributions to the Wikipedia software.

See also[edit]


  1. ^ Friedland, Gerald; Jain, Ramesh (July 28, 2014). Multimedia Computing. Cambridge University Press. p. 151. ISBN 978-0521764513.
  2. ^ More, Max; Vita-More, Natasha (March 5, 2013). "Transhumanist Declaration 2012". The Transhumanist Reader: Classical and Contemporary Essays on the Science, Technology, and Philosophy of the Human Future. John Wiley & Sons. ISBN 978-1118555996.
  3. ^ Brin, David (1999). The Transparent Society. Basic Books. p. 102. ISBN 9780738201443.

External links[edit]