This entry's title is not meant to be snarky.
Since the theme of The Prisoner was that we (and society) are our own jailers ("Who is Number One?" "You are, Number Six!"), with his passing, McGoohan is finally "free", in a way none of us can can ever be truly free in life!
A noted actor and raconteur, McGoohan's greatest success was in three heroic tv series roles:
The Scarecrow in The Scarecrow of Romney Marsh aka Dr. Syn: alias The Scarecrow
John Drake in Danger Man aka Secret Agent
Number Six in The Prisoner (which he conceived and co-created, as well as writing & directing a number of episodes.)
Consider that without his artistic influence, we wouldn't have shows like ABC's LOST, AMC's The Prisoner remake series, or, to a lesser extent, any of the shows like The X-Files or Fringe where you aren't certain who is who and who's running things...
(Personally, I always thought "The Village" was on the other side of the island's mountains on LOST!)