Index: wp-includes/author-template.php
===================================================================
--- wp-includes/author-template.php	(revision 17581)
+++ wp-includes/author-template.php	(working copy)
@@ -291,7 +291,7 @@
 	$authors = get_users( $query_args );
 
 	$author_count = array();
-	foreach ( (array) $wpdb->get_results("SELECT DISTINCT post_author, COUNT(ID) AS count FROM $wpdb->posts WHERE post_type = 'post' AND " . get_private_posts_cap_sql( 'post' ) . " GROUP BY post_author") as $row )
+	foreach ( (array) $wpdb->get_results( apply_filters( 'list_authors_query', "SELECT DISTINCT post_author, COUNT(ID) AS count FROM $wpdb->posts WHERE post_type = 'post' AND " . get_private_posts_cap_sql( 'post' ) . " GROUP BY post_author", $args ) ) as $row )
 		$author_count[$row->post_author] = $row->count;
 
 	foreach ( $authors as $author_id ) {