William Kenneth Russell Mallen was a Canadian professional ice hockey player. He won two Stanley Cups in his career, in 1910 with the Ottawa Senators, and in 1915 with the Vancouver Millionaires. Mallen played over 150 games in his career.

The International Professional Hockey League (IPHL) was the first fully professional ice hockey league, operating from 1904 to 1907. It was formed by Jack "Doc" Gibson, a dentist who played hockey throughout Ontario before settling in Houghton, Michigan. The IPHL was a five team circuit which included Pittsburgh, Pennsylvania, Sault Ste. Marie, Ontario, Sault Ste. Marie, Michigan, Calumet, Michigan and Houghton. The IPHL was instrumental in changing the nature of top-level senior men's ice hockey from amateur to professional.