$field->toUser()
Converts a user email address to a user object
$field->toUser(): User|nullReturn type
User|null
Example
Text file
Title: My great article
----
Author: author@company.comTemplate
<?php if ($author = $page->author()->toUser()): ?>
<aside class="author">
<h2><?= $author->name() ?></h2>
<?= $author->bio()->kirbytext() ?>
</aside>
<?php endif ?>