While playing at University of Wisconsin–Madison (1914–1917), Olsen was named to the All-Big Ten twice for basketball.[1] After graduating from Wisconsin, he began his coaching career at Bradley University and Ripon College. In 1922, Olsen followed George Trautman as head coach of the Ohio State University. In 24 years he guided the Buckeyes to a 259–197 record, as well as five Big Ten championships (1925, 1933, 1939, 1944, 1946). He served as a chair on the NCAA Basketball Committee. Olsen helped initiate the 10-second rule in 1937, which requires teams to advance the ball over the center line within 10 seconds of gaining possession. In 1939, Olsen spearheaded efforts to create the NCAA postseason national playoffs, now known as the NCAA tournament, one that could compete with the National Invitational Tournament, which started play in 1938 with games hosted at Madison Square Garden in New York. The first NCAA tournament in 1939 saw Northwestern University host eight teams. Oregon beat Ohio State to become the first tournament champion in a format that has expanded several times to go with its popularity as the premier tournament for college basketball.
National champion
Postseason invitational champion
Conference regular season champion
Conference regular season and conference tournament champion
Division regular season champion
Division regular season and conference tournament champion
Conference tournament champion