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()orget_the_modified_author(), this should give you the display name of the last user that modified the post.