Mr. Norton has been in so many great shows ... He was Wellington and Lazarenn and G'Kar's dad in Babylon 5. He was Albert Einstein in Star Trek: TNG. In Harry Potter and the Chamber of Secrets, he was Mr. Mason (the gentleman Harry's aunt and uncle were trying to impress, whose wife got covered in cake), and how does he follow these up? That's right. Doctor Who. He was Thomas Kennet in Doctor Who.