a simple if statement, but I am no php writer at all

OK so I simply want it to use the first template path if the post is by a certain author and the other template path if it is by another author. This is the mess I came up with.

<?php get_header(); ?>

<?php if ('author=3'): ?>

<?php include (TEMPLATEPATH . '/nitSingle.php'); ?>

<?php else : ?>

<?php include (TEMPLATEPATH . '/patSingle.php'); ?>

<?php endif; ?>
<?php get_footer(); ?>

How can I make this work? Or can this even work? This is my single.php file I was wanting to do 2 different single post files so one would load with one author and the other with the second author.