Nvidia's billionaire Founder-CEO Jensen Huang has listed "Dishwasher, Busboy, Waiter" as past work experience on his LinkedIn profile. The 61-year-old, who is currently world's 12th richest person with $111 billion fortune, worked at restaurant chain Denny's where he washed dishes and cleaned toilets as a teenager. "To me, no task is beneath me," Huang said while talking about Denny's job.