#10: James and Thomas Duff – Mississippi

Mississippi’s wealthiest title is shared by James and Thomas Duff, each with a net worth of $2.3 billion. Their empire began in 1932 with Duff & Phelps, evolving into Dura Automotive Systems, and establishing them as automotive industry moguls.

Despite their vast fortune, James and Thomas Duff remain grounded, adhering to a simple yet powerful business philosophy: surpassing all in customer satisfaction. This mantra has been central to their success and enduring legacy.