It took awhile for me to figure the right hook for this so I thought I would post it
the key is thematic_navigation_below.
<?php
/* add a Author Bio Box in a new div at bottom of single post*/
function add_author_bio() { if (is_single ()) {
?>
<div ID="author-single">
<div ID="author-info">
<?php echo get_avatar( get_the_author_id() , 80 ); ?>
Author: <a href="<?php the_author_url(); ?>">
<?php the_author_nickname(); ?> </a>
<br />
<?php the_author_description(); ?><br />
<a href="<?php bloginfo('url'); ?>/?author=<?php the_author_ID(); ?>">
<?php the_author_nickname(); ?> has wrote
<?php the_author_posts(); ?> articles for us.</a>
</div>
</div>
<?php
} }
add_action('thematic_navigation_below', 'add_author_bio',1);
?>