ビリー・ビーン
On November 17, 2006, Geren was promoted from his previous position as Athletics bench coach to become the 28th manager in Oakland Athletics franchise history. He replaced Ken Macha, who was fired after disagreements with players and general manager Billy Beane. In 2007, Geren led the A's to a 76–86 record. In 2008, the Athletics finished the season with a 75-86 record.