Michael Dell vs. Bernard Arnault & family

Dell got his start at 19 selling computers out of his University of Texas dorm room, grossing $80,000 by the end of his freshman year. Dell's MSD Capital owns the Four Seasons Maui, plus indirect stakes in Applebees, IHOP, Calvin Klein and reportedly Grand Central Station.

Arnault apparently wooed his wife, Helene Mercier, a concert pianist, by playing Chopin and other classical composers on the piano. Arnault and LVMH own a 40% stake in private equity firm L Catterton, which has $30 billion in assets, including investments in Birkenstock and Equinox.