AGE: 41
OCCUPATION: Creator of Wikipedia
NUMBER OF TIME COVERS: 0
PREVIOUS APPEARANCES ON THE TIME 100: 1
PRO: As the brains behind Wikipedia, Wales, a former options trader, has created the first open-source online encyclopedia truly by the people, for the people.
CON: The digital evangelist has recently come under attack for giving preferential treatment on his site to potential (and realized) romantic conquests, not to mention for skimming cash from his non-profit set-up.