// CLOSE ROBOTS TO AUTHORS
add_filter("wpseo_robots", function($robots) {
	if ( is_author( array(11, 8, 6, 4, 10, 12, 5, 7, 18, 15, 19, 14, 16, 13, 17, 21, 20) ) ) {
					return 'noindex, nofollow';
			} else {
					return $robots;
			}
});