How can you be sure?  Maybe he's just wearing another guy's face?

Edit:  My highest comment ever is now a Face/Off joke.  I have to make this edit to stop people from replying with variations on the name of the movie.  And here's a shout out to the [One True God](https://www.reddit.com/r/onetruegod) who may actually be [pictured above.](http://i.imgur.com/le7AJdK.jpg "Nic Cage")