If you're asking who? then you have never watched reruns of certain of the classic spy shows from the 1960s.
Robert Vaughn was Napoleon Solo, the original (Cavill did a bang up job in the movie, but he's still not the original).
He was also General Hunt Stockwell in the A-Team (another of my guilty pleasures, despite my ardent dislike of Dirk Benedict), played a small role in Superman III, was in a single episode of any number of shows and apparently once played Hitler (Which I can't imagine).
But I'll remember him the most as the suave spy intended to be "TV's answer to James Bond."
He was 83 years old.