Known for his A.I. evangelism and his black leather jackets, Huang, along with Elon Musk and Mark Zuckerberg, has led the trend of tech billionaires dressing like rock stars. On trips to Asia and Europe, he’s sometimes been mobbed by fans—a phenomenon that became known as Jensen-mania. His celebrity has rested on the foundational role that Nvidia plays in the A.I. ecosystem, where its high-powered microchips are used to train and run large language models like ChatGPT and Claude.