When David Ben-Gurion asked Stan Adelstein in 1965 why a Jewish man chose South Dakota, Adelstein answered that life there was "my mission as a Jew." Adelstein, the Rapid City engineer, business leader, philanthropist and former state legislator who spent decades turning that answer into civic work, died on August 10, 2026. He was 94, according to KOTA Territory News.

That exchange in Israel gave Adelstein a phrase broad enough to hold an unusually varied public life. His own account, published by The Question is Why, placed it during an American Jewish Committee mission with his wife, Lynda. The answer linked his faith to a particular place: the Black Hills city where he built a company, helped sustain a synagogue, served constituents and backed institutions well beyond his own community.

Stanford M. Adelstein was born on August 19, 1931, in Sioux City, Iowa, to Morris and Bertha Adelstein, and attended school in Rapid City. He earned bachelor's degrees in civil engineering and business administration from the University of Colorado, served in the U.S. Army Corps of Engineers and returned in 1957 to Northwestern Engineering Company, the business his father had built. Augustana University reported that he became company president in 1968. Under his direction, Northwestern grew into one of the region's largest heavy highway construction companies while expanding into quarry, commercial and residential property.

Adelstein's South Dakota mission also took institutional form. He helped found the Synagogue of the Hills, and The Associated Press reported that the Rapid City congregation occupied a former Adelstein family home donated to the community. He sometimes officiated weddings there.

His public appointments reached beyond Rapid City. President Gerald Ford named him to the National Advisory Council on Economic Opportunity in 1976. He later served on an advisory council for the Federal Reserve Bank of Minneapolis and spent eight years on South Dakota's advisory committee to the U.S. Commission on Civil Rights. Those roles joined business expertise to the civic obligations he described as central to his life.

Elective office came later. Adelstein represented Rapid City's District 32 in both chambers of the South Dakota Legislature beginning in 2001 and resigned from the Senate in 2013. Legislative and news accounts both place his service at more than a decade. The district brought together downtown business interests and residential neighborhoods with different political and cultural perspectives. Tom Katus, a Democrat who held the Senate seat between Adelstein's terms, told SDPB that Adelstein attended his briefings and "always reached across the aisle." Katus's account gave that independence a practical form: Adelstein showed up to hear a political counterpart and offered praise across party lines.

Recognition followed the work. Adelstein received Rapid City's George Award in 1991, was named South Dakota Philanthropist of the Year in 2004 and entered the South Dakota Hall of Fame in 2006. In 2007, his family fund gave $15,000 to digitize historic Black Hills photographs in honor of his grandmother, Betty Martinsky. He said the images might otherwise be lost or become difficult to reach. Fourteen years later, he funded incentives for a Rapid City clinic that delivered more than 100 vaccinations.

His giving reached the Performing Arts Center of Rapid City, St. John's McNamara Hospital, South Dakota Public Broadcasting, Lutheran Social Services and the Synagogue of the Hills. He was survived by Lynda, three children, five grandchildren and a great-granddaughter.

Adelstein's mission remained visible in durable, local things: roads and properties shaped by Northwestern Engineering, a family house remade as a synagogue, Black Hills photographs opened to the public and civic institutions equipped to serve another generation. Together they trace how he answered Ben-Gurion's question, not with a single declaration, but with decades of work in South Dakota.