You might think you don't know who Ian Holm is, but you've seen him in many of your favorites movies.
Holm is one of those quiet giants of the acting world; precisely the type which seems to suit the British rather well. Just like other industry stalwarts (the names Jim Broadbent, Mark Rylance, and Stephen Graham come to mind), he’s lauded by critics but rarely plays the fame game.
That said, you'll probably realize that you are a fan when you see clips of Holm's characters in some really big -and not so big- films from the past several decades at TVOM.