Don James Larsen is an American retired Major League Baseball (MLB) pitcher. During a 15-year MLB career, he pitched from 1953 to 1967 for seven different teams. Larsen pitched for the St. Louis Browns / Baltimore Orioles, New York Yankees (1955–59), Kansas City Athletics (1960–1961), Chicago White Sox (1961), San Francisco Giants (1962–64), Houston Colt .45's / Houston Astros (1964–65), and Chicago Cubs (1967).