As a longtime NBA analyst, I've seen owners come and go—but few like Mark Walter. The Guggenheim Partners CEO, who quietly acquired a 26% stake in the Lakers in 2021, now holds the keys to two of LA's crown jewels: the purple-and-gold and the World Series-champion Dodgers. With conflicting reports placing his net worth between $6B-$12B (thanks to that mysterious 20% Guggenheim stake), we break down how this privacy-obsessed financier became sports' most influential shadow billionaire. Stats, deals, and court-side power plays included.