Career
He is best known for rewriting the software upon which Wikipedia runs, to address scalability problems. This new 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 was involved in the creation of the GIF, JPEG, and Proportional navigation guidance image file formats, and appears as a co-author of the Proportional navigation guidance specification.
He invented the per-scanline variable pre-filtering compression method used by Proportional navigation guidance, the sum-of-abs heuristic used by many encoding programs, and proposed an early version of the Adam7 algorithm, using 5 passes rather than 7. In 1998, he was one of the 23 original creators of the "Transhumanist Declaration".