Ridder began his ice hockey career in 1943 with the Duluth Heralds, an amateur senior ice hockey team in the Duluth Industrial Hockey League. He felt that Minnesota needed a state-level organization to oversee hockey and help grow the sport. Ridder called a meeting in Saint Paul in October 1947, and founded what became the Minnesota Amateur Hockey Association. He served as the first president of the MAHA from 1947 to 1949, and began the process of affiliating with a national body. In December 1947, the MAHA was formally accepted as a member of the Amateur Hockey Association of the United States, becoming the first state association to do so. The MAHA grew quickly and trailed behind only the Ontario Hockey Association, and the Quebec Amateur Hockey Association, in the number of registered players in North America. Ridder successfully lobbied the International Ice Hockey Federation to recognize AHAUS as the group responsible to represent the United States in ice hockey at the Olympic Games, and was also able to organize and finance the United States men's national ice hockey team. He was the manager of the American team in Oslo at the 1952 Winter Olympics, which resulted in a silver medal and a second place finish behind Canada. He returned to manage the American team in Cortina d'Ampezzo at the 1956 Winter Olympics, which resulted in another silver medal and a second-place behind the Soviet Union. Ridder was one of the eight original co-owners of the Minnesota North Stars. His group paid the $2 million expansion fees in the 1967 NHL expansion to bring a National Hockey League team to the Minneapolis–Saint Paul area.
Media business
Ridder worked in the family business Ridder Publications, which merged into the Knight Ridder media company. His media career began by reporting news for WEBC, and several newspapers in the Minnesota area including the Duluth News Tribune, Grand Forks Herald, Saint Paul Dispatch, and the St. Paul Pioneer Press. He purchased WDSM radio in 1948, and became its president. Ridder was the first in his family to buy into television, becoming president of WCCO-TV in 1949, and WCCO Radio in 1952. He also served as the assistant secretary and director of Ridder Publications, he was vice president and director of Northwest Publications, Dispatch Realty, Aberdeen News and the Grand Forks Herald, and was a director of Mid-Continent Radio Television and Midwest Radio Television.
Charitable work
Ridder volunteered with the American Red Cross, the Saint Paul Urban League, and the Saint Paul United Fund. He served on the USA Hockey Foundation, and was a director for its Hall of Fame. He was a co-chair of the task force to build a women's-only hockey arena at the University of Minnesota. Ridder and his wife contributed $500,000 towards the construction of Ridder Arena, dedicated to the Minnesota Golden Gophers women's ice hockey team, but he died before its completion.
Ridder received the AHAUS citation award in 1967, for of contributions towards American amateur hockey He was inducted into the United States Hockey Hall of Fame in 1976. He received the Lester Patrick Trophy during the 1993–94 NHL season, in recognition of his contribution to ice hockey in the United States. He was inducted into the IIHF Hall of Fame in 1998, in the builder category. He was posthumously inducted in the inaugural class of the Minnesota Broadcasting Hall of Fame in 2001. The American Hockey Coaches Association recognized Ridder and his widow in 2009 with the Joe Burke Award, for dedication to women's ice hockey. The University of Minnesota awards the "Kathleen C. and Robert B. Ridder Scholarship" annually to a student athlete on the Golden Gophers women's ice hockey team.
