Harzinski played football for Swoyersville High School. In 1932, he attended Wyoming Seminary and starred in football, baseball and track and his accomplishments earned his a place on the school’s Hall of Fame. Harzinski then took his athletic talents to Fordham University where he played baseball and football. In 1935, “Packy” was given a tryout with the Elmira Pioneers of the NYP league and played for two years with them. In 1938 he joined the Brooklyn Dodgers and became a starter at third base. He was traded to New Orleans in 1939 and spent eleven years as a minor league player and player/manager. In 1956, Harzinski began scouting the eastern region for the Washington Senators. He continued scouting when the Senators moved to Minnesota and became the Twins.