Create authors page with gravatar using the loop

Alright I am hoping this is a simple fix. I am trying to simply add a gravatar to my authors pages. The issue is with the code I have the gravatar shows up just as many times as the number of posts the author has.

You can see what I mean here:
author a:http://www.aquaculturetalk.com/author/seacucumber/
author b:http://www.aquaculturetalk.com/author/mike/

This is the code:
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
<?php echo get_avatar( get_the_author_email(), ’80’ ); ?>
<?php endwhile; else: ?>
<p><?php _e(‘Sorry, no posts matched your criteria.’); ?></p>
<?php endif; ?>

I am using the loop in another section of the page, but I am hoping I can just modify this code to make the gravatar show up only once.