Denny Sanford dies at 90, leaving a health care legacy
T. Denny Sanford, the Sioux Falls banking entrepreneur and philanthropist, has died at age 90. Denny Sanford gave nearly $2 billion to Sanford Health alone, reshaping care, research, and civic life across South Dakota and far beyond the Upper Midwest. Sanford Health and regional outlets confirmed the news on Saturday, July 18, 2026.
Key Takeaways
- T. Denny Sanford died at 90; he founded First PREMIER Bank and PREMIER Bankcard.
- His gifts to Sanford Health totaled nearly $2 billion, including a landmark $400 million pledge in 2007.
- He was called South Dakota’s most significant philanthropist, with impact beyond medicine.
- Sanford Health said it would be the primary beneficiary of his estate and remain based in Sioux Falls.
Who was Denny Sanford and why does his death matter?
Sanford built his fortune after buying a struggling Sioux Falls bank in 1986, renaming it First PREMIER Bank and later launching PREMIER Bankcard. At his death he was chairman and CEO of PREMIER’s holding company, United National. The PREMIER organization employs more than 1,500 people.
His death matters because those business gains funded unmatched philanthropy in South Dakota history—well over $1 billion in total giving. For more profiles of wealth and giving, see our Net Worth & Wealth coverage.
How did Denny Sanford change health care?
According to Sanford Health News, his health-system giving began with $16 million in 2004 for a children’s hospital and peaked with a $400 million gift in 2007 that renamed Sioux Valley Hospitals as Sanford Health.
Later gifts included $100 million for the Edith Sanford Breast Center, $125 million for Sanford Imagenetics, $350 million for a virtual care center, $300 million for graduate medical education and community health, and $300 million toward Sanford Black Hills Medical Center. Dakota News Now also cited the children’s hospital, breast center, and Imagenetics among his signature projects.
Sanford Health now reports about 55,000 employees and care for more than two million patients across the Upper Midwest. CEO Bill Gassen said Sanford empowered researchers and clinicians to “think big” at a pace not otherwise possible.
What else defined Denny Sanford’s legacy?
Born in Minnesota in 1935, Sanford lost his mother to breast cancer at age four—an experience that shaped his focus on children and women’s health. He graduated from the University of Minnesota in 1958 with a psychology degree, then built businesses including Contech before banking.
Beyond hospitals, gifts included tens of millions for the Sanford Underground Research Facility, Children’s Home Society, education programs, athletics, and civic projects such as The Sanford District. He often said he wanted to “inspire before you expire” and live a life of significance.
Former Sioux Falls mayor Paul TenHaken called him the primary catalyst behind the city’s trajectory, saying no one had a more significant impact on Sioux Falls or South Dakota.