function get_author_bio($content='') {
    global $post;
    if (!is_page()) {
        $post_author_description=get_the_author_meta("description");
        $html="\n";
        $html.="<p><em>";
        $html.= $post_author_description."";
        $html.="</em></p>";
        $content .= $html;
    }
    return $content;
}
add_filter('the_content', 'get_author_bio');