Index: wp-content/themes/twentyfourteen/functions.php
===================================================================
--- wp-content/themes/twentyfourteen/functions.php	(revision 26655)
+++ wp-content/themes/twentyfourteen/functions.php	(working copy)
@@ -359,6 +359,7 @@
 	$contributor_ids = get_users( array(
 		'fields'  => 'ID',
 		'orderby' => 'post_count',
+		'order'   => 'DESC',
 		'who'     => 'authors',
 	) );