# Thomas Duff (businessman)

Thomas Milton Duff (born December 31, 1956) is an American billionaire businessman and philanthropist. Alongside his brother, James Duff, he co-owns Southern Tire Mart, the nation's largest truck tire dealer and retread manufacturer, and Duff Capital Investors, the largest privately owned business in Mississippi. With a net worth of $3.3 billion, the Duff brothers are the wealthiest individuals in Mississippi. In addition to his business ventures, Duff has been involved in public service, serving on the Mississippi Institutions of Higher Learning Board of Trustees and supporting Republican political campaigns. He is also known for significant philanthropic contributions to Mississippi universities.

## Early life and education

Duff was born on December 31, 1956, and raised in Columbia, Mississippi. His mother is Bobbie Baggett Duff and his father is Ernest Duff, a lawyer and businessman on the side. He has three siblings, James Duff, Stephen Duff, and Jane Duff Thomley.
In 1974, he graduated from Columbia High School. In 1979, Duff graduated with a bachelor's degree in business administration from the University of Southern Mississippi.

## Career

Ernest Duff, Thomas’s father, founded Southern Tire Mart in 1973. Thomas and his brother James both worked there as teenagers and assumed control of the struggling company in 1983, later selling it in 1998 to Tire Distribution Systems. In 2003, they purchased the company back for $15 million and rebranded it as Southern Tire Mart. At the time of the purchase, sales revenue was $90 million. By 2023, Southern Tire Mart's revenues had grown to exceed $3.5 billion, making it the nation’s largest truck tire dealer and retread manufacturer. It remains the largest of the companies under the Duff Capital Investors (DCI) umbrella.
Thomas Duff and his brother James co-founded Duff Capital Investors, a holding company with total revenues exceeding $5 billion. DCI is the largest privately owned business in Mississippi, employing over 15,000 people. Since 2009, the brothers have been the only members of the Forbes 400 list from Mississippi. However, the Duffs did not make the 2024 list, despite having a net worth of $3.3 billion. Together, they remain the wealthiest individuals in Mississippi.

### Politics

Duff is a major contributor to Republican campaigns in Mississippi. He donated at least $32,000 to Governor Tate Reeve's campaigns.
Duff formed a political action committee (PAC) in December 2024 to help elect Republicans in 2025 municipal and special legislative elections. He is considering a run for Mississippi governor in 2027. He attended the Neshoba County Fair, the state's preeminent political gathering, in 2024.
He supported Jeb Bush in the 2016 Republican Party presidential primaries.

## Philanthropy

He and his brother have made contributions totaling around $50 million to the University of Southern Mississippi, the University of Mississippi, and Mississippi State University.

## Personal life

He is divorced with two children and lives in Hattiesburg, Mississippi. He is a member of The Church of Jesus Christ of Latter-Day Saints.
Duff was the subject of a murder plot in 2016 to extort money; 3 individuals were arrested.