Duane Siverson began his coaching career at Concordia in 1978 and established himself as one of the most successful coaches in Cobber athletic history. Siverson coached both men's and women's basketball and men's and women's golf at Concordia for more than three decades combined. He also presided over the school's inaugural fastpitch softball team in 1987. Siverson guided the Cobbers' women's basketball squad to back-to-back NCAA Division III National Championship appearances, winning it all in 1988 - the same season Siverson was recognized as National Coach of the Year. In seven seasons at the helm for that program, Siverson's teams won four MIAC titles, appeared in seven NCAA Tournaments, and reached the national quarterfinals four times. The Cobbers spent five consecutive seasons ranked among the nation's top five teams under Siverson's tutelage.
Siverson also coached the Cobber men's basketball team to three of their four most winning seasons, as well as the program's first NCAA Tournament appearance in 1996. His 338-263 career coaching record makes him the all-time winningest basketball coach at Concordia. As a women's golf coach, he guided the team to six NCAA top-three finishes, and 11 of the school's first 12 MIAC golf championships from 1989 to 2000. The MIAC Golf Coach of the Year in 1998 and 1999, Siverson was also named NCAA Division III Region IV Coach of the Year by the National Golf Coaches Association (NGCA) in 2001. He coached 19 All-Americans during his tenure as head golf coach, including the national champion in 1981 and national runner-up in 1992. He was inducted into the Concordia Athletics Hall of Fame in 2012.