He is the son of Tom Herr, who was also a professional baseball player and Aaron's high school coach. His younger brother, Jordan, is a member of the Great Falls Voyagers, the Rookie-level affiliate of the Chicago White Sox.
Granted free agency after the season, Herr signed a minor-league contract with the Cleveland Indians, and played for the AAA-level Buffalo Bisons. Herr had his best season with Louisville in 2007, when he hit a .274 batting average with thirty-one doubles and nineteen home runs and played as a member of the 2007 International League All-Star team.[4][5]
On June 23, 2008, he was traded back to the Cincinnati Reds organization for cash considerations, and he was assigned to the Louisville Bats.[6]
The return home
On March 5, 2009, his hometown Lancaster Barnstormers signed Aaron Herr for the 2009 season. His return to Lancaster is the result of the Cincinnati Reds dropping him from their system after a severe groin injury. Herr's signing with the Barnstormers is his attempt to show an affiliated team that he is healthy enough for professional baseball.[7] Coincidentally, his father is Lancaster's bench coach for the 2009 season.
Herr retired following the 2011 season.
Trivia
Aaron served as a batboy for the St. Louis Cardinals in the 1980s, when his father played on the team.[8]