Peter Beck of Rocket Lab comes to mind (recommended read - Ashley Vance's When the Heaven's Went on Sale). Beck didn't attend Uni, was a tool and die maker at

Peter Beck of Rocket Lab comes to mind (recommended read - Ashley Vance's When the Heaven's Went on Sale). Beck didn't attend Uni, was a tool and die maker at Fisher & Paykel (they make fridges and respirators). He then went on and took on the world who said "you can't build a rocket company in New Zealand".