Lucy Guo attends the 2022 Forbes 30 Under 30 Summit at Detroit Opera House on October 03, 2022 in Detroit, Michigan. She was recently named the youngest self-made billionaire woman in a new Forbes ...

Lucy Guo, the 30-year-old cofounder of Scale AI, has become the youngest self-made woman billionaire by holding onto her stake long after leaving the company.

In 2016 Alexandr Wang, 20, took time off from his graduate computer science studies at MIT. He headed to Silicon Valley to join his friend and fellow developer Lucy Guo, 23. Two years earlier, Guo ...