It shouldn't work.It is one of the most coveted secrets in the world. It is knowledge any nation would break every law they had for. And it is being concealed by nothing more a pair of glasses. Typically horn-rims. Utterly ridiculous. Completely unbelievable...
...right?
Or... it's a pair of glasses, yes. But it's also posture. Stand in the right (or in this case, wrong) way and lose four inches off your height. Now choose your wardrobe -- badly. Pick clothes so utterly unfashionable that no one looks at them too long, much less at the body type underneath -- and in this case, you picked clothing two sizes too large for you, so that body is pretty well hidden: you have bulk, but no definition.
Voice? Speak a full octave higher. Use no phrases in one that you do in the other. Make any accent vanish in a single place and appear for the second. In fact, change every gesture and mannerism you have. If one appearance does something, the other does not: period.
Avoid having much of a social life. Retreat behind a byline: if people know you, it's by the name at the top of a story and who even glances at those these days? You turn in your work, you show up at the office, and whoever sells you your groceries can't be bothered to glance at your face.
Pretend to be completely in the open when the glasses are off. Tell them everything they want to hear and make them suspect there is no other name lurking in the shadows. The costume is full-time. You have nothing to hide and why would you ever need to?
Make sure no one ever gets a truly clear photograph. Wipe down all fingerprints. Obliterate DNA traces as an automatic habit.
Now put it all together...
...and it's still a pair of glasses. But it's also something more. And a disguise which could not, should not ever work starts to become just a little bit plausible.
http://tvtropes.org/pmwiki/pmwiki.php/Main/ClarkKenting
Even so, you are one damn lucky son of a bitch.
Oliver Queen? You are on notice. And so is your one in a million beard.