In September 1946, he was hired as the manager of the Yankees, replacing Bill Dickey. His stint in New York lasted only 14 games (8-6) through the third-place Yankees' final regular season game. During the offseason, he was hired by the Cincinnati Reds as the successor to Hall of Fame manager Bill McKechnie. Neun piloted the Reds for all of and through August 5, 1948, compiling a record of 117–137 (.461). He was dismissed after 100 games in in favor of Bucky Walters. He continued working in the game, and into his eighties was a scout and instructor for the Milwaukee Brewers.