I was hoping it would turn out to be Kellyanne Conway. Oh, well. It is what it is.
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Excellent letter. Trump's base won't read it. Undecideds should read it.
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Miles addresses why he chose to publish anonymously. "[M]y reasoning was straightforward, and I stand by it. Issuing my critiques without attribution forced the President to answer them directly on their merits or not at all, rather than creating distractions through petty insults and name-calling. I wanted the attention to be on the arguments themselves. At the time I asked, “What will he do when there is no person to attack, only an idea?” We got the answer. He became unhinged. And the ideas stood on their own two feet."
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Now that he has revealed himself to be Anonymous, Kayleigh McEnany comes out to attack him personally, as you would expect. I can't wait to see Trump's Tweets and to find out what insults and made up names he will use to disparage Miles -- not realizing that he will only end up disparaging himself.

“Anon” painted himself as a hero who used his high ranking position to thwart Trump’s agenda.  Now that we know who he really was, one has to wonder what those heroic actions were.

WH admins denied everything at the time: POTUS is a stable genius; no one ever disobeys his orders; etc.. However, there were MANY accounts that verified the claims made in the Op Ed: Material removed from Trump's desk, lest he sign it. Insane Trump orders ("Yes, sir, Mr. President!") countered the minute Trump leaves the room. "Are we really going to do that?" "No way. Get back to work." Like a 3-year old, there is no worry that Trump will even remember asking for his toy and then getting distracted by watching cartoons on TV (Fox). It was reported by many people at the time that it occurred that Trump told Border Patrol that he would pardon them if they broke the law; Trump left the room and the head guy told his officers that they are NOT going to break the law. Tillerson told off Trump at a major meeting with Top Brass present that the US Military is not a mercenary force to be used to enrich the US Treasury. And the list goes on.

Deputy Chief of Staff to the Director of Homeland Security is hardly an 'office boy' or 'nobody'. Keep in mind, staff are the people who do the actual work once policy has been set. He would be in a better position to know detailed information than his Secretary would. He would have been interacting with the staff of all the National Security principles in the administration, and likely briefing principles on matters under his direction.  

It's disturbing how willfully ignorant people can be in protecting their little bubbles of reality. No longer surprising, but disturbing.