Who is this person?

[L Verge]

I've been out fa-la-la-ing all day. When I first saw the question, I immediately thought it had to be a lawyer (which Eva later confirmed). My thoughts were 1.) Walter Cox, who defended Arnold, O'Laughlen, and maybe Spangler(?) and 2.) Frederick Stone. However, Frederick Stone was a Charles County native and is buried in his home county (I think). Walter Cox was a D.C. native of Georgetown, and Oak Hill is in Georgetown, so that's my final guess. Do I win a million dollars?

A little extra, Cox was appointed a federal judge later on and presided over the trial of assassin Charles Guiteau.

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Since we're wandering through beautiful Oak Hill, what other child of a President - besides William Wallace Lincoln - was buried there and then re-interred elsewhere?