tiny-change.php

<?php 
/*
  Plugin Name: tinyChangeAuthor
	Plugin URI: https://gist.github.com/ideag/5174195/
	Description: Change post author on save
	Author: @IdeaG (tinyStudio)
	Version: 0.1
	Author URI: http://wp.tribuna.lt
 */

add_action( 'save_post', 'tiny_change_author' );

function tiny_change_author( $post_id ) {
  if ( !wp_is_post_revision( $post_id ) ) {
    remove_action('save_post', 'tiny_change_author');
    wp_update_post(array('ID' => $post_id, 'post_author' => 1));
    add_action('save_post', 'tiny_change_author');
  }
}
?>