Dhaka, Nov. 13 -- Jensen Huang's abrupt resignation from Nvidia has turned revelations about his private life into a wider controversy over alleged Chinese espionage and America's technological rivalry with Beijing.

The 63-year-old stepped down as chief executive and president on Nov 12, ending more than three decades of leadership at the company he helped build into an artificial intelligence powerhouse.

Nvidia confirmed his departure and appointed Chief Financial Officer Colette Kress as interim chief executive, without specifying why he had resigned.

But the circumstances surrounding his downfall have prompted competing explanations, ranging from corporate misconduct and an alleged Chinese intelligence operation to suggestions that ...