When was the Pearl Jam album which Brendan O'Brien never worked on released? 
Backspacer:  It was recorded from February through April 2009 with producer Brendan O'Brien, who had worked on every Pearl Jam album except their 1991 debut "Ten" and 2006's self-titled record—although this was his first production credit since 1998's "Yield". Ten (Pearl Jam album): Ten is the debut studio album by American rock band Pearl Jam, released on August 27, 1991 through Epic Records.
August 27, 1991