PublishPress Authors Pro is an excellent plugin for managing multiple authors and guest authors in WordPress. Here is a breakdown of its key features:

PublishPress Authors (Free Version):

1. Multiple Authors: Allows assigning multiple authors to a single WordPress post.
2. Author Profiles: Create detailed author profiles with various fields and custom layouts.
3. Guest Authors: Capability to add guest authors who don't require a site account.
4. Author Pages: Showcases individual author's work with customizable pages displaying post information.
5. Custom Fields: Add custom fields (Text, WYSIWYG, Links, email, etc.) to author profiles.

PublishPress Authors Pro (Additional Features):

1. Author Profiles for WordPress and Guests: Extends author profile functionality to both WordPress users and guest users.
2. Various Display Options: Show authors under content, via shortcodes, in widgets, etc.
3. Avatar Selection: Choose avatars for each author for better identification.
4. Custom Post Type Support: Allows managing authors for custom post types.
5. Enhanced Fields: Basic fields like Name, Email, Bio, and additional custom fields.
6. Custom Layouts: Design and implement custom layouts for author profiles.
7. Brand Removal: Removes ads and branding specific to PublishPress.
8. Priority Support: Access to faster and advanced technical support.

The Pro version significantly expands the capabilities of the free version by providing additional display options, customizable layouts, enhanced support for various user types, and the ability to create fields tailored to your specific needs.

Whether you're running a multi-author blog, collaborative website, or publication, PublishPress Authors Pro seems like a powerful tool for managing and showcasing your authors' work efficiently.