WpRecipes.com - Daily recipes to cook with WordPress

To create the function, just paste the code below in your functions.php file:

if (!function_exists('get_the_modified_author')) {
  function get_the_modified_author() {
    global $post;
    if ( $last_id = get_post_meta($post->ID, '_edit_last', true) ) {
      $last_user = get_userdata($last_id);
      return apply_filters('the_modified_author', $last_user->display_name);
    }
  }
}

if (!function_exists('the_modified_author')) {
  function the_modified_author() {
    echo get_the_modified_author();
  }
}

Once you saved the file, you can display the name of the latest author who modified the post by using this code:

<?php the_modified_author(); ?>

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Credits goes to Valentin Brandt for this awesome recipe!