NEW YORK — Chips made by US chip titan Nvidia push the boundaries of artificial intelligence, but its leader Jensen Huang is in the spotlight over an affair with an alleged Chinese spy. Unknown to the public just four years ago, the 63-year-old is a powerful entrepreneur, drawing stadium crowds as he presents cutting-edge components essential to the development of AI tools like ChatGPT. Media reports last week said US intelligence officials believe Huang grew close to a Chinese executive who was funneling information to Beijing. Nvidia's board said on Sunday it had opened a probe into the CEO and co-founder, who acknowledged having been unfaithful to his wife and said he was "deeply sorry." Big tech's insatiable appetite for chips designed by Nvidia, known as Graphics Processing Units (GPUs), has catapulted the California chipmaker to a market valuation of $4.5 trillion, among the world's largest. Its meteoric rise has made Huang one of the world's richest people -- worth around $160 billion, according to Forbes -- thanks to the roughly four percent stake he holds in the company he foun