Sherman Duane Ellingson, 86, went to his heavenly home on Sunday, April 26, 2015, in Rapid City. Duane was born June 2, 1928, in Maddock, ND, to Elmer and Betsy Ellingson. Duane graduated high school from Benson County Agricultural Training School. He furthered his education to become a medical technician. He also obtained specialized credit union training. In 1949, he married his high school sweetheart, Dorothy Bratvold. They were blessed three wonderful loving daughters. Duane farmed with his father and brother until 1950, when his health required him to make a change. He worked as the lab and x-ray technician at Memorial Hospital and the Benson County Clinic as well as manager of the Benson County Co-op Credit Union. In 1969, the family moved to Rapid City, where he became President of Black Hills Federal Credit Union. Duane served on the Credit Union League Board, Corporate Central Board, Rapid City Credit Bureau Board, as NCUA National Director, and Black Hills Chapter President. In 1982, he was named Credit Union Person of the Year. Duane was a progressive leader, visionary, and pioneer in the Credit Union movement. He retired from BHFCU in 1983. On April 30, 2007, BHFCU honored Duane and his family by dedicating the Ellingson Boardroom at their corporate offices. In 2008, he was inducted into the Mid-America Credit Union Hall of Fame for his contribution to his credit union movement in the Dakotas. Duane was a member of the Maddock Country Club, Maddock Wildlife Club, Rapid City Elks Club, Charter Member and past President of the Sons of Norway Borgund Lodge. He was a 31-year season ticket holder for Post 22 Baseball and a long-time member of the SDSM&T Hardrocker Club. He was a past member of Viking and North Viking Lutheran Churches in Maddock, ND; and a member of South Canyon Lutheran Church in Rapid City. Duane was proud of his Norwegian heritage and had a deep and abiding love for Norway. He had a sense of adventure and loved to travel making many lifelong friends along the way. He was preceded in death by his parents, his brother Gordon, and his son-in-law Jack Kurle. He is survived by his wife, Dorothy of Rapid City; daughters, Myrna Kurle, Judith Duggan (Rich), and Donna Ellingson-Mack (Dave); grandchildren, Betsy Gerber (Brian), Michael Kurle (Amanda), Lynette LeFleur, and Jordan Fickbohm; and three great-grandsons, Jacob, Mitchell, and Jared. Visitation will be from 5 p.m. to 6:30 p.m. Wednesday, April 29, at Osheim & Schmidt Funeral Home. Services will be at 10:30 a.m. Thursday, April 30, at South Canyon Lutheran Church, with the Rev. Bruce Thalacker officiating. Memorials may be directed to the American Heart Association.