Alexandr Wang — Billionaire at 25 (Scale AI)

Wang dropped out of MIT at 19 to co-found Scale AI, which provides data labeling for AI companies. When the AI boom exploded, Scale became essential infrastructure — used by OpenAI, Meta, and the U.S. Department of Defense. The company hit a $14 billion valuation in 2024, making Wang a billionaire at 25 and the youngest self-made billionaire in America at the time. He was born in Los Alamos, New Mexico to physicist parents. While other founders chase consumer apps, Wang built the picks-and-shovels business of the AI gold rush. The smartest boring company in Silicon Valley.