wordpress is pretty flexible, actually. if you want to learn more about customizing wordpress and hone your skills, you can also do this without a plugin.
for example, you can create a custom category template, and give query_posts a variable of an author id, via a URL query string. (nb: you'd have to create a custom template for each new category)
ohh... you could also create a custom author template, and give query_posts a category to deliver. that would be good too.
since i have this handy, here's an basic example of how you'd do it with custom category templates.
1- create a custom category-x.php file in your theme folder. in this case i'm doing the default category-1.php
this is a basic one that works with WP default theme:
<?php get_header(); ?>
$thisauthor = $_GET['author'];
<?php query_posts("author=$thisauthor") ?>
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<h3><?php the_title(); ?></h3>
<?php the_content(); ?>
<?php endwhile; ?>
<?php else : ?>
<p>No posts by that author</p>
<?php endif; ?>
<?php get_footer(); ?>
2- then, create links to this page (URL query string) and send it the variable of the author ID. i use permalinks and make links like this:
you can make these links using the list authors functionality.
references in the Codex:
also try... http://codex.wordpress.org/Author_Templates