Ladies and gentlemen, christopher lee

The tallest actor thing doesn't sound right. Unless its a tie as I can think of several 6' 5" actors.
Just checked and apparently Dolph Lundgren, Tim Robbins, Vince Vaughn, and Tyler Perry are all 6' 5" and James Cromwell is 6' 7"

Wasn't Andre the Giant something like 7' plus?

Well what do you expect from Gandalf?