function my_doc_title($title, $separator){
  if(is_author()) // <- replace this with your custom page; maybe is_page_template(\'myprofile.php\') ?
   $title = get_the_author_meta(\'display_name\', get_query_var(\'author\')).$separator.get_bloginfo(\'name\');
  return $title;
}
add_filter(\'wp_title\', \'my_doc_title\', 10, 2);

(functions.php)