Answer the question at the end by quoting:

William James Dixon (July 1, 1915 - January 29, 1992) was an American blues musician, vocalist, songwriter, arranger and record producer. He was proficient in playing both the upright bass and the guitar and was a capable singer, but he is perhaps best known as one of the most prolific songwriters of his time. Next to Muddy Waters, Dixon is recognized as the most influential person in shaping the post-World War II sound of the Chicago blues. Dixon's songs have been recorded by countless musicians in many genres as well as by various ensembles in which he participated.
Dixon signed with Chess Records as a recording artist, but he began performing less, being more involved with administrative tasks for the label. By 1951, he was a full-time employee at Chess, where he acted as producer, talent scout, session musician and staff songwriter. He was also a producer for the Chess subsidiary Checker Records. His relationship with Chess was sometimes strained, but he stayed with the label from 1948 to the early 1960s. During this time Dixon's output and influence were prodigious. From late 1956 to early 1959, he worked in a similar capacity for Cobra Records, for which he produced early singles for Otis Rush, Magic Sam, and Buddy Guy. He later recorded for Bluesville Records. From the late 1960s until the mid-1970s, Dixon ran his own record label, Yambo Records, and two subsidiary labels, Supreme and Spoonful. He released his 1971 album, Peace?, on Yambo and also singles by McKinley Mitchell, Lucky Peterson and others.  Dixon is considered one of the key figures in the creation of Chicago blues. He worked with Chuck Berry, Muddy Waters, Howlin' Wolf, Otis Rush, Bo Diddley, Joe Louis Walker, Little Walter, Sonny Boy Williamson, Koko Taylor, Little Milton, Eddie Boyd, Jimmy Witherspoon, Lowell Fulson, Willie Mabon, Memphis Slim, Washboard Sam, Jimmy Rogers, Sam Lay and others.  In December 1964, the Rolling Stones reached number one on the UK Singles Chart with their cover of Dixon's "Little Red Rooster". In the same year, the group also covered "I Just Want To Make Love To You" on their debut album, The Rolling Stones.

what kind of administrative tasks did he perform?

he acted as producer, talent scout, session musician and staff songwriter.

Some context: Kim was born Han Jae-joon (hanjaejun; Han Zai Jun ) in Gongju, Chungcheongnam-do, South Korea. His real birthday, as revealed by his biological mother, was on 4 February, instead of 26 January. At a young age, he was given up for adoption by his biological mother to the Kim family, and his name was changed to Kim Jae-joong. When Kim was fifteen, he moved to Seoul by himself in order to take part in the auditions held by SM Entertainment.
Apart from TVXQ and JYJ, Kim has worked on solo activities as a singer. He sang "Insa" (insa lit. Greeting) for the soundtrack of A Millionaire's First Love. Kim collaborated with label-mates The Grace for the Japanese version of their song "Just for One Day", which was featured on their fifth Japanese single and their debut album, Graceful 4.  Kim also sang the solo track "Maze" for the fifth and final single of the Trick Project, "Keyword/Maze". Jaejoong wrote and composed "Wasurenaide" (Wang renaide, lit. Don't Forget) which was included on Tohoshinki's twenty-fifth single "Bolero/Kiss the Baby Sky/Wasurenaide." The song was also on their fourth Japanese album The Secret Code, along with the songs "9095" and "9096" which were also composed by Kim. The song, "Wang renaide" was used in an television advertisement for cosmetics in Japan.  On 30 September 2009, Kim and bandmate Yoochun released a self-composed single "Colors (Melody and Harmony)/Shelter." The A-side track, Colors (Melody and Harmony), was used as the image song for Hello Kitty's thirty-fifth anniversary. Jaejoong and Yoochun also participated in m-flo's album m-flo TRIBUTE -maison de m-flo, singing the track "Been So Long".  Kim sang "Love" for the soundtrack of the film Heaven's Postman in which he starred as the male lead. He also sang "Found You" and "For you It's Separation, For me It's Waiting" for the soundtrack of the television drama Sungkyunkwan Scandal, "I'll Protect You" for Protect the Boss, and "Living Like A Dream" for Dr. Jin. "Living Like a Dream" was awarded the Best Hallyu Drama OST at the Seoul International Drama Awards.
Did he ever perform live?
A: 

IN: Steve-O was born in the Wimbledon, London. His mother, Donna Gay (nee Wauthier), was Canadian, and his father, Richard Glover, was American. His paternal grandfather was English and his maternal step-grandfather was voice-over announcer Wayne Howell. His family was based in Brazil for many years due to his father's presidency of the South American division of Pepsi-Cola.

On February 23, 2008 Steve-O joined the rest of the Jackass crew for the Jackass MTV 24 Hour Takeover, which promoted JackassWorld.com. He participated in several stunts, and even debuted his rap music video which was executive produced by recording artist D-Jukes, leading to Mike Judge bringing back the duo of Beavis and Butt-head for the first time in years to criticize it. Later, during the live broadcast Steve-O was kicked out of MTV studios on the request of executives for his behavior and intoxication.  On March 9, 2008, after receiving an e-mail from Steve-O that suggested his possible suicide, Steve-O's friends, including co-star Johnny Knoxville, became concerned he was a danger to himself and consulted with physician Dr. Drew Pinsky, who told them to get Steve-O to a hospital immediately. Steve-O was placed on a 72-hour psychiatric hold which was later lengthened to 14 days due to an alleged suicide attempt. In a mass e-mail addressed to his friends, Steve-O expressed that he previously had thought of his drug use and bipolarity as a "good thing", but that he now realizes that his drug use was apparently hurting those he loved most.  On June 4, 2008, Steve-O pleaded guilty to felony possession of cocaine. He avoided jail by the successful completion of his treatment program. In July, after 115 days of sobriety, Steve-O announced he was "back in the loony bin". He returned to the mental institution, he said, because "I've had horrible mood swings and severe depression. My brain is fucked up from using so much cocaine, ketamine, PCP, nitrous oxide, and all sorts of other drugs."

when did he join jackass

OUT:
On February 23, 2008