Elon Musk

Elon Musk simultaneously led Tesla, SpaceX, xAI, X (Twitter), Neuralink, and The Boring Company in 2025 while serving as head of the Department of Government Efficiency under the Trump administration. His personal net worth peaked at $400 billion — the largest in history — while SpaceX's Starship and Tesla's Optimus humanoid represented the most ambitious engineering bets of the decade.