Yahoo! CEO (and liar) Scott Thompson.
On May 3, activist shareholder Dan Loeb pointed out that Yahoo! CEO Scott Thompson never obtained a degree in computer science, despite what his official Yahoo! bio claims. (The bio has since been altered.)
Apparently, Thompson has been lying about his credentials for at least ten years. When Thompson worked for eBay (as CTO of the PayPal division), his bio contained the statement: "Scott received a bachelor’s in accounting and computer science from Stonehill College.