Task: Question Answering
Input (English): Passage: In February 2011, Gaga released "Born This Way", the lead single from her studio album of the same name. The song sold more than one million copies within five days, earning the Guinness World Record for the fastest selling single on iTunes. It debuted atop the Billboard Hot 100, becoming the 1,000th number-one single in the history of the charts. Its second single "Judas" followed two months later, and "The Edge of Glory" served as its third single. Both reached the top 10 in the US and the UK. Her music video for "The Edge of Glory", unlike her previous work, portrays her dancing on a fire escape and walking on a lonely street, without intricate choreography and back-up dancers.
Gaga hosted an episode of Saturday Night Live in November 2013, performing "Do What U Want" (with Kelly) and an album cut, "Gypsy". After holding her second Thanksgiving Day television special on ABC, Lady Gaga and the Muppets Holiday Spectacular, she performed a special rendition of "Do What U Want" with Christina Aguilera on the fifth season of the American reality talent show The Voice. In March 2014, Gaga had a seven-day concert residency commemorating the last performance at New York's Roseland Ballroom before its closure. Two months later, she embarked on the ArtRave: The Artpop Ball tour, building on concepts from her ArtRave promotional event. Earning $83 million, the tour included cities canceled from the Born This Way Ball tour itinerary. In the meantime, Gaga split from longtime manager Troy Carter over "creative differences", and by June 2014, she and new manager Bobby Campbell joined Artist Nation, the artist management division of Live Nation Entertainment. She briefly appeared in Rodriguez's Sin City: A Dame to Kill For, and was confirmed as Versace's spring-summer 2014 face with a campaign called "Lady Gaga For Versace".In September 2014, Gaga released a collaborative jazz album with Tony Bennett titled Cheek to Cheek. The inspiration behind the album came from her friendship with Bennett, and fascination with jazz music since her childhood. Before the album was released, it produced the singles "Anything Goes" and "I Can't Give You Anything but Love". Cheek to Cheek received generally favorable reviews; The Guardian's Caroline Sullivan praised Gaga's vocals and Howard Reich of the Chicago Tribune wrote that "Cheek to Cheek serves up the real thing, start to finish". The record was Gaga's third consecutive number-one album on the Billboard 200, and won a Grammy Award for Best Traditional Pop Vocal Album. The duo recorded the concert special Tony Bennett and Lady Gaga: Cheek to Cheek Live!, and embarked on the Cheek to Cheek Tour from December 2014 to August 2015. 
Question: What is the full name of Lady Gaga's manager after she split with Troy Carter?
Output (English): Bobby Campbell.