So you want to style a post depending on its author?

?View Code PHP
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<?php
/*
Plugin Name: Add Author Class
Plugin URI: http://cedmax.net
Description: extends post_class() to add author class
Version: 1
Author: cedmax
Author URI: http://cedmax.net
*/
function add_author_class($class) {
	array_push($class, 'author-'.get_the_author_meta('user_nicename'));
	return $class;
}
 
add_filter("post_class", "add_author_class" );
?>

you’re welcome