The solution `<?php query_posts('posts_per_page=9'); ?>` to limit author related posts show the entire website post :( 


      <?php
        $curauth = (isset($_GET['author_name'])) ? get_user_by('slug', $author_name) : get_userdata(intval($author));
      ?>
      <h2>About: <?php echo $curauth->nickname; ?></h2>
      <dl>
        <dt>Website</dt>
        <dd><a href="<?php echo $curauth->user_url; ?>"><?php echo $curauth->user_url; ?></a></dd>
        <dt>Profile</dt>
        <dd>
          <?php echo $curauth->user_description; ?>
        </dd>
      </dl>
    
      <h2>Posts by <?php echo $curauth->nickname; ?>:</h2>
    
      <ul>
        <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
          <li>
            <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link: <?php the_title(); ?>">
              <?php the_title(); ?>
            </a>,
            <?php the_time('d M Y'); ?> in
              <?php the_category('&');?>
          </li>
    
          <?php endwhile; else: ?>
            <p>
              <?php _e('No posts by this author.'); ?>
            </p>    
          <?php endif; ?>
      </ul>