Question: Who was the producer of the studio album that was supported by Pearl Jam's Vs. Tour?

full_context: Document 1: Backspacer: Backspacer is the ninth studio album by the American alternative rock band Pearl Jam, released on September 20, 2009. The bandmembers started writing instrumental and demo tracks in 2007, and got together in 2008 to work on an album. 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". Material was recorded in Henson Recording Studios in Los Angeles, California and O'Brien's own Southern Tracks Recording in Atlanta, Georgia. The music on the album—the shortest of the band's career—features a sound influenced by pop and new wave. The lyrics have a more optimistic look than the ones in the politic-infused predecessors "Riot Act" and "Pearl Jam", something frontman Eddie Vedder attributed to the election of Barack Obama.
Document 2: Pearl Jam 2012 Tour: The Pearl Jam 2012 Tour was a concert tour by the American rock band Pearl Jam. The first leg of the tour consisted of thirteen shows in Europe, including a headling appearance at the Isle of Wight Festival. American punk band X were the opening band for the arena shows. Due to high ticket demand for pre-sale tickets, the third-party website handling the sale had to be taken offline. The Pearl Jam fanclub cited "an act of sabotage" to the site. For the second show at the Ziggo Dome in Amsterdam, a fan of the band created the setlist.
Document 3: Vitalogy: Vitalogy is the third studio album by the American rock band Pearl Jam, released on November 22, 1994, through Epic Records. Pearl Jam wrote and recorded "Vitalogy" while touring behind its previous album "Vs." (1993). The music on the record was more diverse than previous releases, and consists of aggressive rock songs, ballads and other elements making this Pearl Jam's first experimental album.
Document 4: Vs. (Pearl Jam album): 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.
Document 5: No Code: No Code is the fourth studio album by the American rock band Pearl Jam, released on August 27, 1996 through Epic Records. Following a troubled tour for its previous album, "Vitalogy" (1994), in which Pearl Jam engaged in a much-publicized boycott of Ticketmaster, the band went into the studio to record its follow-up. The music on the record was more diverse than what the band had done on previous releases, incorporating elements of garage rock and worldbeat.
Document 6: Rearviewmirror: "Rearviewmirror" is a song by the American rock band Pearl Jam. The song is the eighth track on the band's second studio album, "Vs." (1993). Although credited to all members of Pearl Jam, it was primarily written by vocalist Eddie Vedder. The song was included on Pearl Jam's 2004 greatest hits album, "rearviewmirror (Greatest Hits 1991–2003)".
Document 7: Ride the Lightning Tour: The Ride the Lightning Tour was the second concert tour by American thrash metal band Metallica. The tour was in support of Metallica's second studio album "Ride the Lightning". Tank provided tour support in Europe, with WASP and Armored Saint supporting in North America. Metallica performed for the first time at Monsters of Rock in front of 70,000 people.
Document 8: Villains World Tour: The Villains World Tour is an upcoming concert tour by American rock band Queens of the Stone Age. The tour is set to take place from June to November 2017, to support the band's seventh studio album, "Villains", which will be released in August 2017. The tour was announced on 15 June 2017, one day after the album’s announcement. English rock band Royal Blood are set to support the band on the North American leg of the tour.
Document 9: Animal (Pearl Jam song): "Animal" is a song by the American rock band Pearl Jam, released in 1994 as the third single from the band's second studio album, "Vs." (1993). Although credited to all members of Pearl Jam, it features lyrics written by vocalist Eddie Vedder and music primarily written by guitarist Stone Gossard. The song peaked at number 21 on the "Billboard" Mainstream Rock Tracks chart. The song was included on Pearl Jam's 2004 greatest hits album, "rearviewmirror (Greatest Hits 1991–2003)".
Document 10: Yield (album): Yield is the fifth studio album by the American alternative rock band Pearl Jam, released on February 3, 1998. Following a short promotional tour for its previous album, "No Code" (1996), Pearl Jam recorded "Yield" throughout 1997 at Studio Litho and Studio X in Seattle, Washington. The album was proclaimed as a return to the band's early, straightforward rock sound, and marked a more collaborative effort from the band as opposed to relying heavily on frontman Eddie Vedder to compose the songs. The lyrics deal with contemplative themes, albeit seen in a more positive manner compared to the band's earlier work.
Document 11: Vs. Tour: The Vs. Tour was a concert tour by the American rock band Pearl Jam to support its second album, "Vs."
Document 12: Go (Pearl Jam song): "Go" is a song by the American rock band Pearl Jam, released in 1993 as the first single from the band's second studio album, "Vs." (1993). Although credited to all members of Pearl Jam, it features lyrics written by vocalist Eddie Vedder and music primarily written by drummer Dave Abbruzzese. The song peaked at number three on the "Billboard" Mainstream Rock Tracks chart. The song was included on Pearl Jam's 2004 greatest hits album, "rearviewmirror (Greatest Hits 1991–2003)".
Document 13: List of Pearl Jam band members: Pearl Jam is an American alternative rock band that formed in Seattle, Washington in 1990. The original incarnation of Pearl Jam included bassist Jeff Ament, guitarists Stone Gossard and Mike McCready, vocalist Eddie Vedder, and drummer Dave Krusen. This line-up recorded Pearl Jam's debut studio album, "Ten". Krusen left the band in May 1991, three months before the album was released.
Document 14: Nevermind: Nevermind is the second studio album by American rock band Nirvana, released on September 24, 1991 by DGC Records. Produced by Butch Vig, "Nevermind" was the band's first release on DGC. It was also their first album to feature drummer Dave Grohl.
Document 15: Pearl Jam (album): Pearl Jam (sometimes referred to as The Avocado Album or simply Avocado) is the eighth studio album by American alternative rock band Pearl Jam, released on May 2, 2006 on J Records. It was the first and only release for J Records, their last album issued by Sony Music. It was the band's first full-length studio release in almost four years, since "Riot Act" (2002). Following their performances at the Vote For Change tour in 2004, the band commenced work on "Pearl Jam" in November 2004 at Studio X in Seattle, Washington and finished in February 2006.
ground_truth: Brendan O'Brien