#10. Connie Mack: 49 years at Philadelphia Athletics
Connie Mack holds the record of being the longest-serving manager in MLB history. He coached the Philadelphia Athletics from 1901 to 1950. There are a number of elite records he holds in the MLB. He has registered the most number of victories (3,731), losses (3,948) and games managed (7,755). Connie also holds the distinct record of being the first manager to win the World Series thrice. In his career span, he helped the team to 5 Series titles and 9 American League pennants rank. Connie found himself immortalized when he was elected to the Baseball Hall of Fame in 1937.