Excluding author box for certain authors on posts

Try this and let me know if it works. The syntax might be off. This would require you to add the id of each author that works for the site.

$getid = $posts[0]->post_author;
if($getid == 3){
// Do something that is specific for user with ID 3

<div id="authorbox">
    <?php if (function_exists('get_avatar')) { echo get_avatar( get_the_author_email(), '80' ); }?>
<div class="authortext">
<h4>About <?php the_author_posts_link(); ?></h4>
       <p><?php the_author_description(); ?></p>
</div>
</div>

}
else{
// Do Nothing
}

Thanks for responding!
Yes, when I try that code it has a syntax error
Parse error: syntax error, unexpected '<'

You may have to open and close php in spots to get it to work. Anyway, I think $getid = $posts[0]->post_author; is the direction you need to go. Sorry i suck at PHP still. See if this changes anything.

<?php $getid = $posts[0]->post_author;
if($getid == 3){?>
// Do something that is specific for user with ID 3

<div id="authorbox">
    <?php if (function_exists('get_avatar')) { echo get_avatar( get_the_author_email(), '80' ); }?>
<div class="authortext">
<h4>About <?php the_author_posts_link(); ?></h4>
       <p><?php the_author_description(); ?></p>
</div>
</div>

<?php}
else{
// Do Nothing
}?>

Hey, perfect, I was actually just now trying closing of the tags and also using echo ‘authorbox code’;. However, I had put the closing } before the second <?php

And, this code works! I just had to put a space between <?php and } but it works.
And actually, it blocks out the code on every page except UserID 3. So I just reversed it and it works so well. Thanks for your help!

FYI, here is what I ended up doing:

<?php $getid = $posts[0]->post_author;
if($getid == 3){
// Do Nothing

}
else{
?>
// Do something that is specific for user with ID 3
<div id="authorbox">
    <?php if (function_exists('get_avatar')) { echo get_avatar( get_the_author_email(), '80' ); }?>
<div class="authortext">
<h4>About <?php the_author_posts_link(); ?></h4>
       <p><?php the_author_description(); ?></p>
</div>
</div>
<?php
}
?>