Thomas Duff is the co-founder of Duff Capital Investors and the co-owner of Southern Tire Mart, the nation’s largest truck tire dealer. As the wealthiest individual in Mississippi, alongside his brother James, he manages a multi-billion dollar empire spanning trucking, construction, and energy. In early 2026, his influence has expanded into the political arena following the launch of his "Duff PAC" and growing speculation regarding a 2027 gubernatorial run. A prominent philanthropist, he has donated tens of millions to Mississippi’s public universities. His leadership is defined by an "outsider" business perspective and a commitment to regional economic development.

James Duff, co-owner of Duff Capital Investors, has built one of America’s largest family-owned business empires, anchored by Southern Tire Mart—the nation’s biggest commercial tire dealer and retreader. Together with his brother Thomas, Duff expanded the Mississippi-based company through disciplined operations, relentless customer service, and strategic acquisitions, turning it into an industry powerhouse serving fleets nationwide. Beyond Southern Tire Mart, the Duffs oversee a diversified portfolio spanning transportation, construction, hospitality, and agriculture, establishing James Duff as one of the most influential private business leaders in the American South.