For at least the past thirty years there has been much speculation – in books, in articles in magazines, in newspapers and in academic journals, and latterly via the medium of the internet – about whether David Myatt is the person behind the pseudonym Anton Long, and thus is the person who founded the occult group the Order of Nine Angles (ONA, O9A), authored its esoteric philosophy  and at least 95% of its texts from books such as The Black Book of Satan, Naos, the Deofel Quartet, to tracts such as Culling As Art, Guidelines for the Testing of Opfers, Concerning Esoteric and Exoteric Languages, and those in the 2010 collection The Requisite ONA: A Practical Guide to The Sinister Sorcery of The Order of Nine Angles.
While Myatt himself has always denied being Anton Long and challenged anyone to provide actual evidence that he is in fact Anton Long, his denial has not stopped anti-fascist groups such as Searchlight – and more recently ‘hope not hate’ – nor journalists nor the majority of modern self-declared Satanists from blithely asserting that Myatt is Anton Long. Neither has Myatt’s repeated denial stayed the hand of those who – again blithely, without providing any supporting evidence – state that ‘Myatt is a Satanist’ and that he was and still is ‘involved with the Satanic Order of Nine Angles’, and therefore knows or is a friend or colleague of or is somehow involved with, or supports the opinions and views of, anyone anywhere who without any evidence declares themselves to be ONA or is by others assumed to be ONA
So common did it – and has it – become for people to assume Myatt is Long that, as Senholt noted , the author Goodrick-Clarke in his book Black Sun: Aryan Cults, Esoteric Nazism, and the Politics of Identity  used the name Myatt when referring to what Anton Long had written or what others alleged Long had done, written, or said, without Goodrick-Clarke providing any supporting evidence for his assumptions.
However, as JR Wright mentioned in the 2013 edition of her article David Myatt, Satanism, and the Order of Nine Angles:
“Several academics who have studied the Order of Nine Angles have concluded that David Myatt is not Anton Long. For instance George Sieg wrote that the idea that Myatt is Long is “implausible and untenable based on the extent of variance in writing style, personality, and tone” between Myatt and Long’s writings. Professor Connell Monette considered it was quite possible that ‘Anton Long’ was a pseudonym used by multiple individuals over the past 30 years, while Professor Jeffrey Kaplan asserted that Myatt and Long are separate people and that the individual who used the pseudonym Anton Long was a friend of Myatt’s in the 1970s and 1980s.” 
As for Myatt, he has from the 1980s on consistently maintained that his involvement with occultism in the 1970s and early 1980s was, in his words,
“for the singular purpose of subversion and infiltration in the cause of National-Socialism, with part of this being to spread racist ideas and denial of the holocaust. Thus one such occult group I associated with was a honeytrap, and the whole intent was political, revolutionary, not occult and not to with ‘satanism’. It was a matter of using, or trying to use, such occult groups for a specific neo-nazi purpose without any interest in or personal involvement with the occult.” 
Which fact Myatt communicated in the 1990s to Professor Kaplan , and to others .
Thus, unless and until someone provides substantive evidence – for example in the form of authentic documents, or video recordings of Myatt at some ONA ceremony, or verifiable statements by Myatt himself or by the person who – suspected by some to be Anton Long – was “a friend of Myatt’s in the 1970s and 1980s” – then such claims that “Myatt is Anton Long”, and that “Myatt is or was a Satanist” will remain unproven, mere rumours and hearsay, and thus will be dismissed by those who use reason and honour as their guides.
For as Monette wrote, “the founder of the [ONA], Anton Long, has remained a mystery to members of the movement, as well as to academics.” 
Which is perhaps as it should be: a mystery, as befits an occult group which so many self-declared modern Satanists – following as they do the satanism propagated by Howard Stanton Levey, by Aquino, and by others – seek and have sought to discredit and belittle and who continue to emote that “the ONA is a joke, a fake” and who declare that it “doesn’t exist” despite the fact that the ONA is not only a particular and complex esoteric philosophy and thus – having been written about in printed books – has a place in the domain of reality and thus an objective being, but is also “a movement, a subculture or perhaps metaculture that its adherents choose to embody or identify with.” 
Which mystery also befits the persona of Anton Long who – in the supposed guise of David Myatt – so many self-declared modern Satanists, so many self-declared followers of some modern Western Left Hand Path, so many self-declared ‘thelemites’, and so many others – for whatever reason and from what motive – dislike and seek to defame, to castigate, and to libel. As Tennyson once wrote: “the grand old name of gentleman, defamed by every charlatan”. To which we might add “and defamed by ideologically – or financially – motivated hack writers and journalists”.
 The esoteric philosophy of the ONA is detailed in the 2013 article The Radical Sinister Philosophy of Anton Long: A Review of The Contemporary Secret Society Known As The Order of Nine Angles, which is currently [January 2016] available at https://lapisphilosophicus.wordpress.com/about-2/philosophy-of-anton-long/ and archived at http://www.webcitation.org/6ewvIIDOs
That this esoteric philosophy – and the praxises derived from it or which ‘presence’ it – has roots in European paganism and Greco-Roman mysticism has been explained by R. Parker in works such as ἀρρενόθηλυς: Alchemical And Hermetic Antecedents Of The Seven Fold Way Of The Order Of Nine Angles (e-text, 2015) and books such as The Pagan Order of Nine Angles, 2015, ISBN ISBN 978-1518885143.
 The Sinister Tradition. Paper presented by Jacob Senholt at the international conference Satanism in the Modern World, Trondheim, 19-20th November, 2009. The paper is available [as of January 2016] at http://www.webcitation.org/6bpiHBIrr (pdf)
 New York University Press, 2002. ISBN 978-0814731550.
 The article is currently [January 2016] archived at http://www.webcitation.org/6ewuZhSas
The references cited in the article are as follows:
§ Sieg, George. Angular Momentum: From Traditional to Progressive Satanism in the Order of Nine Angles. International Journal for the Study of New Religions, volume 4, number 2. 2013. p.257.
§ Monette, Connell. Mysticism in the 21st Century. 2013. Sirius Academic Press. p.92
§ Kaplan, Jeffrey. Religiosity and the Radical Right: Toward the Creation of a New Ethnic Identity, in Jeffrey Kaplan and Tore Bjørgo (editors), Nation and Race: The Developing Euro-American Racist Subculture. Northeastern University Press. 1998. p.115.
 Myatt, David. A Matter of Honour. e-text, 2012.
 Kaplan, op cit.
 Letter from David Myatt to a Mr. Williams dated July 1994. The letter is mentioned by Kaplan, op cit, p.125, with Kaplan writing that “Myatt frankly states that his own long history of interaction with England’s occult underground was undertaken in a clandestine effort to influence some of these adherents to adopt National Socialist beliefs.”
 Monette, op cit.