When Breadon parted company with his longtime general manager, Hall of Famer Branch Rickey, at the close of the 1942 campaign, Walsingham became the club's chief of baseball operations, although the GM title was not formally assigned to him.
Walsingham continued as a vice president of the Cards, GM without portfolio, and a member of its board of directors after Breadon sold the club to Robert E. Hannegan and Fred Saigh in November 1947.
Walsingham stepped in as the team's official National League representative and chief executive, as rumors swirled that he would assemble a syndicate to buy the franchise.
"[2] In 1957, Walsingham was named an executive vice president with the American League's Baltimore Orioles — ironically, the transplanted St. Louis Browns, who from 1902 to 1953 fought an ultimately losing battle against the Cardinals for the affections of the city's fans before leaving town.
Walsingham was dismissed on October 30, 1958 and eventually replaced by Lee MacPhail, who became general manager after Richards agreed to relinquish those duties.