Not far from the storied venture capital firms on Sand Hill Road, there’s a palatial estate where Masayoshi Son, Silicon Valley’s newest kingmaker, shapes the future. Reaching him requires ...

On an evening at the turn of the millennium, Masayoshi Son had a rousing message for the entrepreneurs who flocked to Tokyo's ...

While some of the featured leaders were ones you’d expect—cabinet nominees, congressional leaders, megadonor Elon Musk—at least one was a surprise: Masayoshi Son, the Japanese billionaire ...