WP_Model-Shariq-Khan-Question.php

<?php
Class Post extends WP_Model
{
    public $postType = 'post'; // Deault WordPress 'post' post type
    public $attributes = [];
    public $virtual = [
      'author'
    ];
    
    
    public function _getAuthor(){
      return get_user_by('id', $this->_post->post_author);
    }
}

$defaultPost = Post::find(1);
$email = $defaultPost->author->user_email;