O'Malley is considered by baseball experts to be "perhaps the most influential owner of baseball's early expansion era." Following the 1957 Major League Baseball season, he moved the Dodgers to Los Angeles, and New York's Dodgers fans felt betrayed. O'Malley was also influential in getting the rival New York Giants to move west to become the San Francisco Giants, thus preserving the two teams' longstanding rivalry. He needed another team to go with him, for had he moved out west alone, the St. Louis Cardinals— away— would have been the closest National League team. The joint move made West Coast road trips more economical for visiting teams. O'Malley invited San Francisco Mayor George Christopher to New York to meet with Giants owner Horace Stoneham. Stoneham was considering moving the Giants to Minnesota, but he was convinced to join O'Malley on the West Coast at the end of the 1957 campaign. Since the meetings occurred during the 1957 season and against the wishes of Commissioner of Baseball Ford Frick, there was media gamesmanship. On April 15, 1958, the Dodgers and Giants ushered in West Coast baseball at Seals Stadium. When O'Malley moved the Dodgers from Brooklyn the story transcended the world of sport and he found himself on the cover of "Time". The cover art for the issue was created by sports cartoonist Willard Mullin, long noted for his caricature of the "Brooklyn Bum" that personified the team. The dual moves broke the hearts of New York's National League fans but ultimately were successful for both franchises – and for Major League Baseball as a whole. In fact, the move was an immediate success as well since the Dodgers set a major league single-game attendance record in their first home appearance with 78,672 fans. During the first year after the move, the Dodgers made $500,000 more profit than any other Major League Baseball team and paid off all of their debts. This did not assuage many Dodgers fans in New York; many years later, newspaper writers Pete Hamill and Jack Newfield each challenged the other to choose the three worst people of the 20th century. Independently, they produced identical lists: "Hitler, Stalin, O'Malley."