When the station began regular broadcasts in April 1948, he provided play-by-play for a televised baseball game between the Minneapolis Millers and a team from Louisville.
Jack Horner also broadcast the first live televised game of the Harlem Globetrotters and provided one of the last interviews of Babe Ruth.
He largely retired from broadcasting in the late 1960s, spending time working for the local Chamber of Commerce and the March of Dimes.
Jack Horner, "Mr. Sports," compiled one of the most impressive lists of firsts in broadcasting history, and has set high standards for those who followed him.
He also was active as a volunteer, broadcasting a weekly one-hour sports show for Minnesota State Services for the Blind for over 20 years.