The self-made billionaire leaves behind a legacy of charitable contributions across South Dakota and beyond
Category: Obituaries
SIOUX FALLS, S.D. — T. Denny Sanford, a prominent businessman and philanthropist, passed away at the age of 90 on Saturday, as announced by Sanford Health CEO Bill Gassen. His death marks the loss of a figure who significantly shaped the philanthropic and healthcare landscapes in South Dakota.
Sanford's contributions to the state are vast, including major donations that helped launch the children’s hospital in Sioux Falls, the Edith Sanford Breast Center, and Sanford Imagenetics. He was recognized as South Dakota’s most well-known billionaire and had pledged nearly $1 billion to the health system that bears his name. His legacy is one of generosity and commitment to improving the lives of others.
Leaders across South Dakota expressed their condolences and shared memories of Sanford's impact. Governor Larry Rhoden stated, "It is with great sadness that Sandy and I mourn the loss of T. Denny — a man who has so generously and intentionally invested in the great state of South Dakota. His contributions will not be forgotten, and South Dakota will forever be impacted by his legacy. Put simply, he was the greatest philanthropist in South Dakota history." Lt. Governor Tony Venhuizen echoed these sentiments, noting Sanford's role in fostering a culture of philanthropy in Sioux Falls.
In a joint statement from First PREMIER Bank, PREMIER Bankcard, and Sanford Health, the organizations remarked, "Denny always said he wanted to live a life of significance and gave generously. His philanthropy impacted millions of lives and transformed the landscapes of South Dakota and beyond." The statement emphasized that Sanford's passion for helping others was unmatched, with First PREMIER Bank CEO Dana Dykhouse recalling that Sanford often encouraged people to strive for significance rather than mere success.
Sanford made his fortune in the banking and subprime credit card sectors, primarily through First PREMIER Bank and PREMIER Bankcard, which became known for their innovative financial products. His wealth allowed him to become a major benefactor in numerous charitable campaigns throughout South Dakota and beyond. He also became a signatory of the "Giving Pledge," a commitment made by billionaires like Bill Gates and Warren Buffet to give away most of their wealth during their lifetimes or upon their deaths.
Sanford's philanthropic efforts included substantial donations to educational institutions and healthcare facilities, significantly enhancing the resources available to these sectors. His contributions were not limited to healthcare; he also supported various community projects and initiatives aimed at improving the quality of life for South Dakotans. In 2026, he announced a $50 million donation to the Sioux Falls Development Foundation for the redevelopment of the Smithfield site near Falls Park, which will be named the Sanford District.
Born in East St. Paul, Minnesota, Sanford grew up in a modest household. His father operated a garment wholesale business, and Sanford's early life experiences shaped his future ambitions. He often cited his upbringing as a motivating factor in his desire to give back to the community. His philanthropic philosophy was rooted in a belief that wealth should be used to improve the lives of others.
In August 2020, it was revealed that Sanford was the subject of a sealed investigation related to child pornography, though no charges were ever filed. This aspect of his life has remained largely unexplored in public discourse, overshadowed by his extensive philanthropic legacy.
As South Dakota mourns the loss of T. Denny Sanford, discussions about his legacy and the future of his philanthropic endeavors will likely continue. His contributions have left an indelible mark on the state, and many organizations will feel the impact of his absence. Sanford Health President and CEO Bill Gassen remarked, "Denny changed the landscapes of giving. He could have done many things with his money, yet he reinvested it in South Dakota. Our universities are stronger today because of Denny. Our healthcare is stronger today because of Denny. He believed in working harder to help someone other than yourself."
In the coming days, memorial services and tributes are expected to honor Sanford's life and achievements. Leaders from various sectors will likely gather to celebrate his contributions and discuss how to continue his legacy of philanthropy. As the state reflects on his impact, it will also be a time for community leaders to strategize on how to fill the void left by his passing.
Sanford's life story is a reminder of the power of philanthropy and the difference one individual can make in the lives of many. His commitment to living a life of significance will inspire future generations to follow in his footsteps, encouraging a culture of giving and community support.
As South Dakota looks forward, the lessons learned from T. Denny Sanford's life will resonate, reinforcing the importance of generosity and community engagement in shaping a brighter future for all.