Background: Robert Swan Mueller III (; born August 7, 1944) is an American attorney who served as the sixth Director of the Federal Bureau of Investigation from 2001 to 2013. A Republican, he was appointed by President George W. Bush; President Barack Obama gave his original ten-year term a two-year extension, making him the longest-serving FBI director since J. Edgar Hoover. He is currently head of the Special Counsel investigation of Russian interference in the 2016 United States elections and related matters. A graduate of Princeton University, Mueller served as a Marine Corps officer during the Vietnam War, receiving the Bronze Star Medal with Combat "V" for heroism and the Purple Heart Medal.
Context: After receiving his J.D. degree in 1973 from the University of Virginia School of Law, Mueller worked as a litigator at the firm Pillsbury, Madison and Sutro in San Francisco until 1976. He then served for 12 years in United States Attorney offices. He first worked in the office of the U.S. Attorney for the Northern District of California in San Francisco, where he rose to be chief of the criminal division, and in 1982, he moved to Boston to work in the office of the U.S. Attorney's Office for the District of Massachusetts as Assistant United States Attorney, where he investigated and prosecuted major financial fraud, terrorism and public corruption cases, as well as narcotics conspiracies and international money launderers.  After serving as a partner at the Boston law firm of Hill and Barlow, Mueller returned to government service. In 1989, he served in the United States Department of Justice as an assistant to Attorney General Dick Thornburgh and as acting deputy Attorney General. James Baker, with whom he worked on national security matters, said he had "...an appreciation for the Constitution and the rule of law." The following year he took charge of its criminal division. During his tenure, he oversaw prosecutions including that of Panamanian leader Manuel Noriega, the Pan Am Flight 103 (Lockerbie bombing) case, and of the Gambino crime family boss John Gotti. In 1991, he was elected a fellow of the American College of Trial Lawyers.  In 1993, Mueller became a partner at Boston's Hale and Dorr, specializing in white-collar crime litigation. He returned to public service in 1995 as senior litigator in the homicide section of the District of Columbia United States Attorney's Office. In 1998, Mueller was named U.S. Attorney for the Northern District of California and held that position until 2001.
Question: What office did he work at?
Answer: He first worked in the office of the U.S. Attorney for the Northern District of California in San Francisco,

Problem: Background: Michael Andrew McKagan grew up in Seattle's largely working-class University District, the youngest of eight children born to Marie and Elmer "Mac" McKagan. He has been called "Duff" since toddlerhood, to which he once referred as "an Irish thing". Following his parents' divorce, his mother supported the family by taking a job as a medical stenographer. He was taught how to play bass by his brother Bruce, further developing his skills by playing along with the albums 1999 by Prince and Damaged by Black Flag.
Context: In April 1985, McKagan replaced bassist Ole Beich in Guns N' Roses, which was newly founded by singer Axl Rose and guitarist Izzy Stradlin of Hollywood Rose. McKagan's Road Crew bandmates Slash and Steven Adler joined the band two months later. After two days of rehearsal, the line-up played its debut gig at The Troubadour on June 6. In 1987, Guns N' Roses released its debut album, Appetite for Destruction, which to date has sold over 28 million copies worldwide, 18 million of which were in the United States, making it the best-selling debut album of all time in the U.S. The following year, the band released G N' R Lies, which sold over five million copies in the U.S. alone, despite containing only eight tracks, four of which were included on the previously released EP Live ?!*@ Like a Suicide.  In 1990, Steven Adler was fired from the band because of his heroin addiction; he was replaced by Matt Sorum of The Cult.  In May 1991, Guns N' Roses embarked on the two-and-a-half-year-long Use Your Illusion Tour. The following September, the band released the long-awaited albums Use Your Illusion I and Use Your Illusion II, which debuted at No. 2 and No. 1 respectively on the U.S. chart, a feat unachieved by any other group. In November 1991, Izzy Stradlin abruptly left the band; he was replaced by Gilby Clarke of Kill For Thrills. In 1993, the band released "The Spaghetti Incident?", a cover album of mostly punk songs, which proved less successful than its predecessors. McKagan took on lead vocals on four songs, including live favorite "Attitude", originally by the Misfits. That same year, McKagan released his debut solo album, Believe in Me, on which he sang lead vocals and played virtually every instrument.  In 1995, with Guns N' Roses largely inactive, McKagan formed the supergroup Neurotic Outsiders with Steve Jones of the Sex Pistols, John Taylor of Duran Duran, and his Guns N' Roses bandmate Matt Sorum. Originally a gathering of friends jamming together at the Viper Room in Hollywood, they released their self-titled album on Maverick Records in 1996. The band played a brief tour of Europe and North America, before disbanding in 1997. McKagan was the last member of the Appetite for Destruction lineup to leave Guns N' Roses, resigning as bassist in August 1997. McKagan had recently become a father and wrote about his decision to leave in his autobiography, stating "Guns had been paying rent on studios for three years now--from 1994 to 1997--and still did not have a single song. The whole operation was so erratic that it didn't seem to fit with my hopes for parenthood, for stability."
Question: Did McKagan play for Guns N Roses
Answer:
McKagan replaced bassist Ole Beich in Guns N' Roses,