Cas Pielak was a player and coach before turning his attentions to the administration of sport.
In 1972, Pielak became the president of the Saskatchewan Baseball Association, establishing a central office for the province. Cas was president of Baseball Canada, a position he held for ten years (1975-1985), where he was instrumental in developing Level I and II National Baseball Certification Modules and Umpire Development Modules. Cas held the office of vice president of the International Baseball Association from 1976-1984 and then secretary general from 1984-1988.
Pielak was also a founding director of Sask Sport Inc. and a driving force behind establishing lotteries as a fundraising vehicle for sport.