Get the author of the latest revision

I would like to display the author (username) of the latest revision of a post from inside the loop.

I tried get_the_author(), which echoes the username and $post->post_author(), which returns the user_id, but both return the original post author and not the latest revisor.

Try the_modified_author() or get_the_modified_author(), this should give you the display name of the last user that modified the post.