Nvidia CEO Jensen Huang has resigned after his extramarital affair with a Chinese businesswoman who reportedly was also acting as a spy for Beijing raised U.S. national security concerns. The company named Colette Kress as interim CEO. She had been Nvidia's executive vice president and chief financial officer. Nvidia’s board had gathered to discuss Huang’s future after revelations that he was having an affair with a former Megaspeed executive suspected of being a Chinese government agent. Shares of Nvidia, one of the largest companies in the world, fell sharply at the opening bell Thursday.