T. Denny Sanford Obituary, Cause of Death – South Dakota’s Wealthiest Philanthropist Dies at 90
SIOUX FALLS, S.D. — South Dakota’s most well-known billionaire, Thomas Denny Sanford, has died at the age of 90. His passing was announced Saturday morning in an email from Sanford Health CEO Bill Gassen to employees, later confirmed in a joint statement from First PREMIER Bank, PREMIER Bankcard, and Sanford Health.
A Life of Philanthropy
Sanford, often referred to as T. Denny, was a self-made billionaire who built his fortune in the banking and subprime credit card industry through First PREMIER Bank and PREMIER Bankcard in Sioux Falls.
He became South Dakota’s wealthiest person and was widely recognized for his philanthropy. Sanford pledged to “die broke” as part of the Giving Pledge, alongside billionaires like Bill Gates and Warren Buffett. He gifted nearly $1 billion to Sanford Health, which bears his name, and donated millions more to organizations across South Dakota and the United States.
Community Reaction
“Denny was a true friend, champion and believer in Sanford Health’s mission and people,” Gassen wrote in his email to staff. A joint statement added: “Denny always said he wanted to live a life of significance and gave generously. His philanthropy impacted millions of lives and transformed the landscape of South Dakota and beyond.”
Humble Beginnings
Sanford was born in East St. Paul, Minnesota. His father ran a garment wholesale business, and he was named after his father’s business partner, Thomas Denny, who offered to put $50 in a savings account if the child bore his name.
Controversy
In August 2020, Sanford Health acknowledged that Sanford was the subject of a child pornography investigation. All information remains sealed, and no charges were ever filed.
Legacy
Despite controversy, Sanford’s donations reshaped South Dakota’s healthcare, education, and community infrastructure. His name is tied to hospitals, research centers, and charitable initiatives that continue to serve millions.
Rest in peace, T. Denny Sanford. Your philanthropy and impact will remain part of South Dakota’s history. 🕊️
