Thanks miloandrew for the info.
This helps in getting the single post, but not for one specific author. So, following the Loop link you provided and a subsequent link or two from there I found the https://codex.www.ads-software.com/Author_Templates. I tried the $curauth->ID variable, but got a blank page. I then opened the author-template.php file and found $authordata->ID and successfully used it with the code below.
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); if ($authordata->ID == '2') : ?>
<!-- Formatting -->
<?php break; ?>
<?php endif; ?>
<?php endwhile; ?>
<?php else : ?>
<H2 class="center">Not Found</H2>
<P class="center">Sorry, but you are looking for something that isn't here.</P>
<?php endif; ?>