Adding author to recent posts list?

Hi,

I display recent posts by this piece of code:

<!-- item -->
<div class="item" id="previously">
<h2>More Recent Posts</h2>
<div class="item-ctnt">
<ul>
<?php
$posts = get_posts('numberposts=15&offset=2');
foreach($posts as $post) :
?>
<li><span class="sp-date">
<?php the_time('M j'); ?>
: </span> <a href="<?php the_permalink(); ?>">
<?php the_title(); ?>
</a></li>
<?php endforeach; ?>
</ul>
</div>
</div>
<!-- item -->

I would Like to add “by authornickname” to each line.

This code:

<!-- item -->
<div class="item" id="previously">
<h2>More Recent Posts</h2>
<div class="item-ctnt">
<ul>
<?php
$posts = get_posts('numberposts=15&offset=2');
foreach($posts as $post) :
?>
<li><span class="sp-date">
<?php the_time('M j'); ?>
: </span> <a href="<?php the_permalink(); ?>">
<?php the_title(); ?>
</a> by <?php the_author_nickname(); ?></li>
<?php endforeach; ?>
</ul>
</div>
</div>
<!-- item -->

does not do the trick, it displays one and the same author name for all posts, not the name of the author who wrote the post.

Quick help anyone?