Also he was one of the group who set up Paypal along with noted nasty piece of work Peter Thiel (one of Trump’s big financial backers). They then both got rich by selling it on to ebay.
Peter Thiel is a weird guy too- an out gay man who financially supports far right candidates who think he doesn’t deserve any rights. He also took down (mostly left-wing) Gawker Media by helping Hulk Hogan sue them for huge amounts of money over a leaked sex tape.