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Jimmy Donal "Jimbo" Wales (born August 8, 1966) is an American internet entrepreneur and former financial trader. He is best known for co-founding Wikipedia, a nonprofit free encyclopedia, and Fandom (formerly Wikia), a for-profit wiki hosting service. He has also worked on Bomis, Nupedia, WikiTribune, and Trust Café (formerly WT Social).

Born in Huntsville, Alabama, Wales attended Randolph School and earned finance degrees from Auburn University and the University of Alabama. While in graduate school, he taught at two universities, but left before completing a PhD to work in finance, later becoming chief research officer at Chicago Options Associates.

In 1996, he co-founded Bomis, which funded the free peer-reviewed encyclopedia Nupedia (2000–2003). On January 15, 2001, with Larry Sanger and others, he launched Wikipedia, which grew rapidly. Wales became its promoter and public face, though he has at times disputed Sanger's role, claiming sole founder status.

Wales has served on the Wikimedia Foundation Board of Trustees since its creation, holding its board-appointed "community founder" seat. He gives annual "State of the Wiki" addresses at Wikimania. For his role in creating Wikipedia, Time named him one of the 100 most influential people in the world in 2006.