Question: What is the nationality of the person who researched "Underground"?

full_context: Document 1: Greg Hoglund: Michael Gregory "Greg" Hoglund is a recognized author, researcher, and serial entrepreneur in the cyber security industry. He is the founder of several companies, including Cenzic and HBGary. Hoglund contributed a great deal of early research to the field of rootkits, software exploitation, buffer overflows, and online game hacking. His later work focused on computer forensics, physical memory forensics, malware detection, and attribution of hackers. He holds a patent on fault injection methods for software testing, and fuzzy hashing for computer forensics. Due to an email leak in 2011, Hoglund is well known to have worked for the U.S. Government and Intelligence Community in the development of rootkits and exploit material. It was also shown that he and his team at HBGary had performed a great deal of research on Chinese Government hackers commonly known as APT (Advanced persistent threat). For a time, his company HBGary was the target of a great deal of media coverage and controversy following the 2011 email leak (see below, Controversy and email leak). HBGary was later acquired by a large defense contractor.
Document 2: List of Underbelly: A Tale of Two Cities episodes: "" is a thirteen-part Australian television mini-series covering the rise and fall of the Mr. Asia drug syndicate between 1976 and 1987. This second series in the "Underbelly" franchise, based on real events documented by "Age" journalists, John Silvester and Andrew Rule, also depicts the Great Bookie Robbery and the burgeoning corruption within the New South Wales police. (The latter storyline is continued in "".) "A Tale of Two Cities" began screening on 9 February 2009 on the Nine Network, with the first two episodes broadcast back-to-back as a telemovie. The series centres on the partnership between Robert "Aussie Bob" Trimbole and Terry Clark, who is often mistakenly referred to as "Mr. Asia", and their illicit activities, conducted mainly in Sydney and Melbourne. "A Tale of Two Cities", produced in conjunction with Screen Australia, explicitly links itself to the original series by featuring a young Alphonse Gangitano and the narrating character's mother (Jacqui James and Liz Cruickshank, respectively). Following the success of the second series, the Nine Network commissioned a third – "The Golden Mile", which was then followed by "".
Document 3: In the Realm of the Hackers: In The Realm of the Hackers is a 2003 Australian documentary directed by Kevin Anderson about the prominent hacker community, centered in Melbourne, Australia in the late 1980s until early 1990. The storyline is centered on the Australian teenagers going by the hacker names "Electron" and "Phoenix", who were members of an elite computer hacking group called 'The Realm' and hacked into some of the most secure computer networks in the world, including those of the US Naval Research Laboratory, Lawrence Livermore National Laboratory, a government lab charged with the security of the US nuclear stockpile, and NASA. The film runs for 55 minutes and was inspired by the book "Underground", by Melbourne-based writer and academic Suelette Dreyfus.
Document 4: Julian Assange: Julian Paul Assange ( ; born Julian Paul Hawkins, 3 July 1971) is an Australian computer programmer and the founder of WikiLeaks, an organisation which he founded in 2006. He has won accolades including the Sam Adams Award and Martha Gellhorn Prize for Journalism.
Document 5: Gary McKinnon: Gary McKinnon (born 10 February 1966) is a Scottish systems administrator and hacker who was accused in 2002 of perpetrating the "biggest military computer hack of all time," although McKinnon himself states that he was merely looking for evidence of free energy suppression and a cover-up of UFO activity and other technologies potentially useful to the public. On 16 October 2012, after a series of legal proceedings in Britain, Home Secretary Theresa May withdrew her extradition order to the United States.
Document 6: Underground (Dreyfus book): Underground: Tales of Hacking, Madness and Obsession on the Electronic Frontier is a 1997 book by Suelette Dreyfus, researched by Julian Assange. It describes the exploits of a group of Australian, American, and British black hat hackers during the late 1980s and early 1990s, among them Assange himself.
Document 7: Chelsea Manning: Chelsea Elizabeth Manning (born Bradley Edward Manning, December 17, 1987) is a former United States Army soldier who was convicted by court-martial in July 2013, of violations of the Espionage Act and other offenses, after disclosing to WikiLeaks nearly 750,000 classified, or unclassified but sensitive, military and diplomatic documents.
Document 8: LulzSec: Lulz Security, commonly abbreviated as LulzSec, was a black hat computer hacking group that claimed responsibility for several high profile attacks, including the compromise of user accounts from Sony Pictures in 2011. The group also claimed responsibility for taking the CIA website offline. Some security professionals have commented that LulzSec has drawn attention to insecure systems and the dangers of password reuse. It has gained attention due to its high profile targets and the sarcastic messages it has posted in the aftermath of its attacks. One of the founders of LulzSec was computer security specialist Hector Monsegur, who used the online moniker Sabu. He later helped law enforcement track down other members of the organization as part of a plea deal. At least four associates of LulzSec were arrested in March 2012 as part of this investigation. British authorities had previously announced the arrests of two teenagers they allege are LulzSec members T-flow and Topiary.
Document 9: The Cuckoo's Egg: The Cuckoo’s Egg: Tracking a Spy Through the Maze of Computer Espionage is a 1989 book written by Clifford Stoll. It is his first-person account of the hunt for a computer hacker who broke into a computer at the Lawrence Berkeley National Laboratory (LBNL).
Document 10: Sigurdur Thordarson: Sigurdur Thordarson (Sigurður Ingi Þórðarson) was born in 1992 in Reykjavík. He is known for his involvement with the whistleblowing organization WikiLeaks, as well as his interactions with the Federal Bureau of Investigation (FBI). In 2010 he was arrested for stealing and leaking classified information about the bank structure in Iceland. He obtained the information from a lawyer that aided wealthy people in tax evasion, whose name was Gunnar Gunnarsson. Gunnar worked for an investment firm called Milestone ehf. Gunnar obtained Sigurdur's services to set up computer systems and delete data. After Sigurdur was arrested he was introduced to Julian Assange, the editor and founder of WikiLeaks. Sigurdur started his time there in early 2010, and participated in preparing many of WikiLeaks's biggest leaks. After a year in WikiLeaks service Sigurdur was suspected of embezzling funds from the WikiLeaks online store. WikiLeaks filed criminal charges against Sigurdur with the Metropolitan Police of Iceland, who investigated the case and later dropped it due to lack of evidence. Sigurdur later plead guilty to the embezzlement along with other economic crimes, in 2013. Sigurdur was ordered to pay the victims 15 million ISK (roughly $115,000)
Document 11: WikiLeaks-related Twitter court orders: The WikiLeaks-related Twitter court orders were United States Department of Justice 2703(d) orders (so-called because they are authorized by ) accompanied by gag orders (authorized by , both as differentiated from subpoenas and national security letters) issued to Twitter in relation to ongoing investigations of WikiLeaks issued on 14 December 2010. While only five people were individually named within the subpoena, according to lawyer Mark Stephens the order effectively entailed the collection in relation to criminal prosecution of the personal identifying information of over six hundred thousand Twitter users, principally those who were followers of WikiLeaks. The U.S. government also sent Twitter a subpoena for information about Julian Assange and several other WikiLeaks-related persons, including Chelsea Manning. Twitter appealed against the accompanying gag order in order to be able to disclose its existence to its users, and was ultimately successful in its appeal. Subsequent reactions included the discussion of secret subpoenas in the U.S., criticism of the particular subpoena issued, an immediate, temporary 0.5 percent reduction in the number of Twitter followers of WikiLeaks, and calls for the recognition and emulation of Twitter's stance.
Document 12: Junaid Hussain: Junaid Hussain (Arabic: جنید حسین‎ ‎ , 1994 – 25 August 2015) was a British Pakistani black hat hacker and propagandist under the "nom de guerre" of Abu Hussain al-Britani who supported the Islamic State of Iraq and the Levant (ISIL). Hussain, who grew up in Birmingham in a Pakistani-origin family, was jailed in 2012 for hacking Tony Blair's accounts and posting his personal information online. Hussain left the UK around 2013 for Syria. Sporadic reports surfaced from British media in 2014 speculating that Hussein could have been the infamous British executioner Mohamed Emwazi, then only known as his tabloid nickname "Jihadi John".
Document 13: At Long Last Leave: "At Long Last Leave" is the fourteenth episode of "The Simpsons"' twenty-third season, and the 500th episode overall of the series. In the episode, the Simpsons discover that the inhabitants of Springfield have grown tired of them and have secretly decided to throw them out of the city. After being evicted from Springfield, the family members end up in a rugged place without rules and regulations called The Outlands. There, they briefly come across their neighbor Julian Assange, who created WikiLeaks. Assange, who is in fear of extradition to Sweden and then the United States, guest-starred in the episode as himself and recorded his lines over the phone having been granted asylum in the Ecuadorian embassy in Britain, while waiting for the results of "Assange v Swedish Prosecution Authority".
Document 14: Eliot Higgins: Eliot Higgins (born 1979), who previously used the pseudonym Brown Moses, is a British citizen journalist and blogger, known for using open sources and social media to investigate the Syrian Civil War, 2014–15 Russian military intervention in Ukraine and the downing of Malaysia Airlines Flight 17. He first gained mainstream media attention by identifying weapons in uploaded videos from the Syrian conflict.
Document 15: A Rape in Cyberspace: "A Rape in Cyberspace, or How an Evil Clown, a Haitian Trickster Spirit, Two Wizards, and a Cast of Dozens Turned a Database into a Society" is an article written by freelance journalist Julian Dibbell and first published in "The Village Voice" in 1993. The article was later included in Dibbell's book "My Tiny Life" on his LambdaMOO experiences.
ground_truth: Australian