Question: Who was the producer of the studio album that was supported by Pearl Jam's Vs. Tour?
Related documents: [0]  [DOC] Vs. is the second studio album by American rock band Pearl Jam, released on October 19, 1993 through Epic Records. After a relentless touring schedule in support of their 1991 debut album "Ten", Pearl Jam headed into the studio in early 1993 facing the challenge of following up the commercial success of its debut. The resulting album, "Vs.", featured a rawer and more aggressive sound compared with the band's previous release. It was the band's first collaboration with producer Brendan O'Brien, and their first album with drummer Dave Abbruzzese. [END] 
[1]  [DOC] The Vs. Tour was a concert tour by the American rock band Pearl Jam to support its second album, "Vs." [END] 
Answer: 
Brendan O'Brien
Brendan O'Brien