Question: Who is the current editor of the magazine that the fictional character Sharon appears in?

full_context: Document 1: The Escapist (magazine): The Escapist (typeset as the escapist) is an online magazine covering mostly video games as well as movies, comics, TV, and more. Published by Alexander Macris since its inception, it was edited by Julianne Greer up to June 30, 2009, then by Russ Pitts through September 2011, then by Steve Butts until September 4, 2012, then by Susan Arendt until June 14, 2013, then by Greg Tito until January 21, 2015 and is currently edited by Joshua Vanderwall. "The Escapist" was first published on July 12, 2005. "The Escapist" originally ran weekly with a main edition published on Tuesday but it is now updated continuously. On the 15th November 2012 it was announced that the Escapist had been acquired by online media company Alloy Digital from its corporate owner, Themis Media, for an undisclosed sum. In 2014, Alloy Digital merged with Break Media to form Defy Media, the website's present owner.
Document 2: Sara Kingdom: Sara Kingdom is a fictional character played by Jean Marsh in the long-running British science fiction television series "Doctor Who". A security officer for Mavic Chen from the 40th century, she later joined the First Doctor and Steven to work against Chen's interests. She is sometimes classed as a companion of the First Doctor but the BBC's official "Doctor Who" website does not include her in their list of companions. Her status as a companion is commented upon in its Episode Guide.
Document 3: Eleventh Doctor: The Eleventh Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television programme "Doctor Who". He is played by Matt Smith, in three series as well as seven specials, over an almost four-year-long period. As with previous incarnations of the Doctor, the character has also appeared in other "Doctor Who" multimedia.
Document 4: Doctor Who Magazine: Doctor Who Magazine (abbreviated as DWM) is a magazine devoted to the long-running British science fiction television series "Doctor Who". Its current editor is Marcus Hearn, who took over from the magazine's longest-serving editor, Tom Spilsbury, in July 2017. It is currently recognised by "Guinness World Records" as the longest running TV tie-in magazine.
Document 5: List of Doctor Who serials: "Doctor Who" is a British science fiction television programme produced by the BBC. s of 1 2017, episodes of "Doctor Who " have aired, concluding the first half of the  series. This includes one television movie and multiple specials, and encompasses 275 stories over 36 seasons. Additionally, four charity specials and two animated serials have also been aired. The programme's high episode count has resulted in "Doctor Who" holding the world record for the highest number of episodes of a science-fiction programme. In June 2017, it was announced that due to the terms of a deal between BBC Worldwide and SMG Pictures in China, the company has first right of refusal on the purchase for the Chinese market of future series of the programme until and including Series 15.
Document 6: Sharon (Doctor Who): Sharon (last name not given) is a fictional character who appeared in the "Doctor Who Magazine" comic strip based on the long-running British science fiction television series "Doctor Who". She was a companion of the Fourth Doctor.
Document 7: David M. Granger: David Granger (born October 31, 1956) was named editor-in-chief of "Esquire" Magazine in June 1997 and served in that capacity until March 31, 2016, when he was replaced by Jay Fielden. Under Granger, the magazine entered its most successful era. Between 1998 and 2016, "Esquire" was a finalist for 72 National Magazine Awards, the industry's highest honors, and won 17, including the award for General Excellence in 2006. In 2004, it received four National Magazine Awards, the most of any magazine in America. Then in 2009, it won three, again the most of any magazine. Granger is also the editorial director of Popular Mechanics magazine.
Document 8: Nardole: Nardole is a fictional character created by Steven Moffat and portrayed by Matt Lucas in the long-running British science fiction television series "Doctor Who". He is a companion of the Twelfth Doctor, the current incarnation of the alien time traveller known as The Doctor, portrayed by Peter Capaldi. He initially appeared in the 2015 Christmas special "The Husbands of River Song" as a companion of River Song, before returning in the following episode "The Return of Doctor Mysterio", having become the Doctor's companion in the meantime.
Document 9: The Name of the Doctor: "The Name of the Doctor" is the thirteenth and final episode of the seventh series of the British science-fiction drama "Doctor Who" and was broadcast on 18   2013 (2013--) . It was written by Steven Moffat and directed by Saul Metzstein.
Document 10: Guitarist (magazine): Guitarist is a monthly music making magazine published by Future plc in the United Kingdom. It is the longest-established European guitar magazine, and is currently the biggest selling guitar magazine in the UK. The magazine's current editor is Jamie Dickson, who has been in charge since late-2013. Each issue covers three areas: reviews, interview and technique. This may include reviews of newly released guitars, amplifiers and other equipment; interviews with famous and up-and-coming guitar players; and features on the guitar industry, news articles, playing technique with tablature. "Guitarist"'s slogan was previously 'The Guitar Player's Bible', however in 2012 this was changed to simply 'The Guitar Magazine'. In the June 2014 edition, "Guitarist" celebrated its 30th Anniversary.
Document 11: Martha Jones: Martha Jones is a fictional character played by Freema Agyeman in the long-running British science fiction television series "Doctor Who" and its spin-off series, "Torchwood". She is a companion of the Tenth Doctor in "Doctor Who", after Rose Tyler (Billie Piper). According to the character's creator and executive producer Russell T Davies in his non-fiction book "", the character was developed from the beginning with the intention of appearing for a whole of the 2007 series, and to later make guest appearances in subsequent series and crossover appearances in the show's two spin-offs; Martha subsequently made guest appearances in "Torchwood" series two and in "Doctor Who" series four in 2008 and special episode "The End of Time" in 2010. Martha was also intended to make guest appearances in the 2009 series of "Torchwood" and "The Sarah Jane Adventures", but could not due to the actress's other obligations.
Document 12: River Song (Doctor Who): River Song is a fictional character created by Steven Moffat and played by Alex Kingston in the British science-fiction series "Doctor Who". River Song was introduced to the series as an experienced future companion of series protagonist the Doctor, an alien Time Lord who travels through time in his TARDIS. Because River Song is a time traveller herself, her adventures with the Doctor occur out of synchronisation; their first meeting (from the audience's perspective) is his first and apparently her last. In later appearances, River is a companion, romantic interest and eventual wife of the Doctor in his eleventh incarnation portrayed by Matt Smith. River Song was created by "Doctor Who" writer Steven Moffat for the show's fourth series in 2008, under the tenure of executive producer Russell T Davies. When Moffat took over Davies' duties as executive producer, he began expanding on the character's background, depicting adventures earlier in River's timeline, upgrading Alex Kingston from a guest star to a recurring actor in the series. Other actresses have subsequently portrayed younger versions of the character.
Document 13: Donna Noble: Donna Noble is a fictional character in the long-running British science fiction television series "Doctor Who". Portrayed by British actress and comedian Catherine Tate, she is a companion of the Tenth Doctor (David Tennant). Originally appearing in the closing scene of the show's 2006 series and as a special guest star in its following Christmas special, "The Runaway Bride", Tate was not expected to reprise her role as Donna; for series 3 (2007), the Doctor travelled alongside medical student Martha Jones (Freema Agyeman). However, Tate expressed interest in returning to the role, and she returned as Donna for the duration of the series 4 (2008), and in a subsequent 2009-10 Christmas and New Year's special.
Document 14: Top Gear (magazine): Top Gear (stylised in-magazine as TopGear) is an automobile magazine owned by BBC Worldwide and published under contract by Immediate Media Company. It is named after the BBC's "Top Gear" television show. It was first published in October 1993 and is published monthly at a price of £4.35. The major presenters of the television series—Jeremy Clarkson, Richard Hammond, and James May—were regular contributors, along with the series' production staff. "Tame racing driver" The Stig also regularly features in their car tests, though only communicates his thoughts and feelings through the articles of others.
Document 15: Sarah Jane Smith: Sarah Jane Smith is a fictional character played by Elisabeth Sladen in the long-running BBC Television science fiction series "Doctor Who" and two of its spin-offs. In the fictional universe of "Doctor Who" and its spin-offs, Sarah Jane is a dogged investigative journalist who first encounters alien time traveller the Doctor while trying to break a story on a top secret research facility, and subsequently becomes his travelling companion on a series of adventures spanning the breadth of space and time. After travelling with the Doctor in four seasons of the show they suddenly part ways, and after this she continues to investigate strange goings-on back on Earth. Over time, Sarah Jane establishes herself as a committed defender of Earth from alien invasions and other threats, occasionally reuniting with the Doctor in the course of her own adventures, all the while continuing to work as a freelance investigative journalist.
ground_truth: Marcus Hearn