Amusingly enough, the most famous alum of my alma mater probably isn't Matthew Polk... it's probably John Astin (Gomez Addams on the 1960s sitcom version of The Addams Family). :-P
There's a pretty good article about Astin, now in residence at JHU and, by all appearances, reviving the theatre arts program there, in the new issue of the alumni magazine. It's actually pretty good, and pretty interesting, so I thought I'd share it here.
(in the interest of disclosure, JHU's best known "modern" alum might actually be P.J. O'Rourke... but I'll not debate the issue here and now)
EDIT: and just to be perfectly clear :-) as a born and bred Baltimoron myself, I use that epithet as a term of endearment, not slander!