Final answer:
Walter O'Malley worked for the Brooklyn Dodgers as the team's president and owner. He played a significant role in the relocation of the Dodgers from Brooklyn to Los Angeles.
Step-by-step explanation:
Walter O'Malley worked for the Brooklyn Dodgers, a Major League Baseball team, as the team's president and owner. O'Malley played a significant role in the history of baseball, particularly in the relocation of the Dodgers from Brooklyn to Los Angeles in 1958. His decision to move the team westward had a lasting impact on the sport and set a precedent for future franchise relocations.