The toughest two weeks of Wikipedia co-founder Jimmy Wales's career just became a whole lot worse, with a former chief scientist at one of the world's biggest technology companies claiming Wales traded Wiki edits for donations.

Jeff Merkey, a former computer scientist at Novell, claims Wales told him in 2006 that in exchange for a substantial donation from Merkey, he would edit his uncomplimentary Wikipedia entry to make it more favourable.

Merkey made a $US5000 ($5455) donation in 2006 and the edit history for his Wikipedia entry showed that, around the same time, Wales personally made changes to the entry after wiping it out completely and ordering editors to start over.