Rhys Wynne

This plugin adds to Profile Pages an extended “Author Bio”. This allows users to add more information to what they’d feel comfortable adding underneath the post. This Author Bio can be displayed on the author page, as opposed to the standard “Author Description”.
This plugin is a framework, so requires a bit of PHP skill and experience in template editing to make it work.
<ul>
<li>For more features including Google Rich Snippet Integration, check out <a href="http://bloggingdojo.com/wordpress-plugins/author-plus-premium-wordpress-plugin/" rel="nofollow ugc">Author+ Premium WordPress Plugin</a></li>
<li>Blogging Tutorials and WordPress Plugins at <a href="http://bloggingdojo.com/" rel="nofollow ugc">The Blogging Dojo</a></li>
</ul>
<h3>Usage Instructions</h3>
The best place to use this plugin is on the author.php page. I have included a framework for using this plugin.
To begin with, on <code>author.php</code>, add this line. This will get the information on the author.
<pre><code>$author = wp_authorplus_get_user_on_author_page();
</code></pre>
You can then use the standard <code>echo $author->display_name;</code> and similar notation as shown in (The WordPress Codex)[https://codex.wordpress.org/Author_Templates#Using_Author_Information].
To call the extended author descriptions, use <code><?php wp_authorplus_extended_author_bio($author->ID); ?></code> anywhere outside the WordPress Loop, but after you declare $author on wp_authorplus_get_user_on_author_page().
Any questions, please <a href="http://bloggingdojo.com/contact-us/" rel="nofollow ugc">Contact Me</a>

Plugin Name:  Author+ (Lite)

This plugin adds to Profile Pages an extended "Author Bio". This allows users to add more information to what they'd feel comfortable a …

Gianluigi Filippelli

<a href="https://wordpress.org/plugins/co-authors-plus/" rel="ugc">Co-Authors Plus</a> is one of the most useful plugin for multiple authors blogs. This plugin add a widget to add users’ avatars to post also for guest authors and for posts with multiple authors. 
You can also add avatars with a shordcode [blog-post-coauthors]. 
The plugin add also a slider in order to show user’s profile. If you want change the style, you can modify blog-spoiler.css file in the plugin folder.

Co-Authors Widget

The plugin add a widget and a shortcode in order to show authors of an article. It is compatible with Co-Authors Plus.

Plugin Name: Author+ (Lite) vs Co-Authors Widget