Question: Who was a producer who produced albums for both rock bands Juke Karten and Thirty Seconds to Mars?
Context: Tomislav "Tomo" Miličević (] ; born September 3, 1979) is an American musician and record producer best known as the lead guitarist of rock band Thirty Seconds to Mars.  Born in Sarajevo but raised in the United States, Miličević moved to Troy, Michigan in the early 1980s, where he became active in the local heavy metal scene and played in a number of bands, co-founding Morphic.  In 2003, he joined Thirty Seconds to Mars, with whom he achieved worldwide recognition in the mid-2000s after recording the band's second album "A Beautiful Lie" (2005).  Its full-length follow-ups, "This Is War" (2009) and "Love, Lust, Faith and Dreams" (2013), received further critical and commercial success. 30 Seconds to Mars is the debut studio album by American rock band Thirty Seconds to Mars.  It was first released on August 27, 2002, by Immortal Records and distributed by Virgin Records.  The album was produced by Bob Ezrin, Brian Virtue, and Thirty Seconds to Mars, and was recorded in rural Wyoming during 2001 and early 2002.  It had been in the works for a couple of years, with lead vocalist Jared Leto writing the majority of the songs. American rock band Thirty Seconds to Mars has recorded material for four studio albums.  The band was formed in Los Angeles, California, in 1998 by brothers Jared and Shannon Leto.  The duo later expanded to a four-piece when they added guitarist Solon Bixler and bassist Matt Wachter to the line-up.  After signing a contract with record label Immortal Records in 1998, the band began to work with producers Bob Ezrin and Brian Virtue on their debut album, "30 Seconds to Mars", which was released in August 2002.  The album produced two singles, "Capricorn (A Brand New Name)" and "Edge of the Earth".  In early 2003, Bixler left the band due to issues primarily related to touring and was replaced by Tomo Miličević.  Thirty Seconds to Mars released their second studio album, "A Beautiful Lie", in August 2005.  The record, produced by Josh Abraham, was preceded by the single "Attack" and spawned two Kerrang!  Award-winning singles, "The Kill" and "From Yesterday".  The album's title track, "A Beautiful Lie", was released as the fourth single in selected territories. " Hunter", a song originally performed by Björk, was covered by the band and added to the track listing of the album.  In March 2007, Wachter left the group to spend more time with his family and was replaced by Tim Kelleher, performing live only. Brian Virtue is an American Grammy-nominated music producer, engineer and mixer based in Los Angeles, California.  Virtue has worked with artists including Jane's Addiction, Thirty Seconds to Mars, Audioslave, Deftones, Puddle of Mudd, Chevelle, Hawthorne Heights and Crazy Town.  In the early 1990s, he began working in recording studios as an audio engineer which later developed into working as a producer.  Virtue worked with producer Bob Ezrin on Thirty Seconds to Mars' self-titled album in 2001 and 2002, and developed into more work with Ezrin on Jane's Addiction and with Rick Rubin on Audioslave.  In 2007, Virtue moved from Los Angeles to Nashville where he worked from his own studio, including recording Chevelle's "Sci-Fi Crimes".  Virtue also worked on the Jane's Addiction song "Superhero" which is the opening theme to the TV show Entourage. The Carnivores Tour was a co-headlining concert tour by American rock bands Linkin Park and Thirty Seconds to Mars.  It was launched in support of Linkin Park's sixth studio album "The Hunting Party" (2014) and Thirty Seconds to Mars' fourth studio album "Love, Lust, Faith and Dreams" (2013).  The joint tour was officially announced in March 2014 at a press conference, with the full itinerary being revealed.  It began on August 8, 2014 in West Palm Beach, Florida and ended on September 19 in Concord, California, visiting arenas and stadiums throughout North America.  It was promoted by Live Nation and sponsored in-part by Infinity.  American rock band AFI served as the opening act for the tour. "Kings and Queens" is a song by American rock band Thirty Seconds to Mars, featured on their third studio album "This Is War" (2009).  Written by lead vocalist Jared Leto across the United States and South Africa, the track was produced by Flood, Steve Lillywhite and Thirty Seconds to Mars.  According to Leto, the lyrics of "Kings and Queens" explore the triumphant feeling of human possibilities.  The melody of the song contains several qualities similar to that of 1980s adult contemporary musical works and is imbued with elements of progressive rock.  The song was released as the lead single from "This Is War" on October 13, 2009. Thirty Seconds to Mars (commonly stylized as 30 Seconds to Mars) is an American rock band from Los Angeles, California, formed in 1998.  The band consists of Jared Leto (lead vocals, guitar, bass, keyboards), Shannon Leto (drums, percussion) and Tomo Miličević (lead guitar, bass, violin, keyboards, other instruments). Artifact is a 2012 American documentary film.  It was directed by Jared Leto under the pseudonym of Bartholomew Cubbins, and produced by Leto and Emma Ludbrook.  "Artifact" chronicles the modern music business as it charts the legal dispute between Leto's rock band Thirty Seconds to Mars and record label EMI, which filed a $30 million breach of contract lawsuit against them in 2008, after the band tried to exit its contract over a royalties dispute.  Thirty Seconds to Mars is shown working with producer Flood to create the 2009 album "This Is War", meeting with lawyers between recording sessions. Levolution is the second studio album by Australian rock band Juke Kartel, and the first American released album.  Levolution was released to the Australian public through Carved Records on 20 August 2010, and later released to the United States on 28 September 2010.  Produced by Brian Virtue (Jane's Addiction, Velvet Revolver, Thirty Seconds to Mars, Chevelle) and Rick Parashar (Pearl Jam, Alice in Chains, 3 Doors Down, Nickelback), the album features a half-dozen freshly penned tracks and six from the band's 2009 Australian CD, Nowhere Left to Hide, remixed by Dan Korneff (My Chemical Romance, Cavo).  With its overarching theme of personal growth and "the journey we’re all on", says vocalist/lyricist Toby Rand, Levolution finds musical parity in its strong hooks, multi-textured instrumentals and passionate vocals. "Conquistador" is a song by American rock band Thirty Seconds to Mars, featured on their fourth studio album "Love, Lust, Faith and Dreams" (2013).  Written by lead vocalist Jared Leto, who also produced the song with Steve Lillywhite, "Conquistador" features combative lyrics and call-and-response verses.  Described as the "wild child" of the album, it is an alternative rock song with influences and elements from electronica.  Thirty Seconds to Mars premiered the song on Vevo on May 2, 2013, two weeks before the album's release.
Answer: Brian Virtue