public static function send_info_to_director($user_id)
 {
     $directors = User::getByRole('director_of_logistics');
     $user_info = User::getInfo($user_id);
     $headers = array('Content-Type: text/html; charset=UTF-8');
     $subject = 'New Protege is waiting for proposal';
     $link = '<a href="' . get_site_url() . '/wp-admin/admin.php?page=bsalted-proposal-list">See Proposal List</a>';
     foreach ($directors as $director) {
         $body = '<h3>Hello ' . $director->display_name . '</h3>';
         $body .= '<p>New protege ' . $user_info->display_name . ' just paid for the Deposit.</p>' . $link;
         wp_mail($director->user_email, $subject, $body, $headers);
     }
 }