I exchanged email with him a couple of times. The first time, back in November of last year, he had a name on his reply. The second time he had simply "Wretchard the Cat."

I think he probably became fully anonymous after he started getting more attention.

Do yourself a favor, and go through his entire archive. It's time well spent, in my opinion. Wretchard illuminates tactical details and official statements (or silence) to great effect, showing the way the the stategic whole. He obviously puts a great deal of effort into his writing - lots of polish and reduction; the result being a taut, insightful commentary.