Sirius Pro

Simply exclude all author posts from indexing it in SERPs. This plugin allows you to noindex posts for certain authors without modifying the code and it works with most of the available themes. Just install and activate this plugin to add noindex and nofollow meta for all author posts.
Read more about this plugin on <a href="https://siriuspro.pl" rel="nofollow ugc">WordPress</a> blog.

Noindex Author

Simply exclude all author posts from indexing it in SERPs.

Rachel Cherry

Replaces the default WordPress Author meta box (that has an author dropdown) with a meta box that allows you to select the post’s, or page’s, author via Autocomplete.
Can really come in handy if you have a lot of authors and are tired of scrolling through that long author dropdown.
<h3>Credits</h3>
Big shoutout to <a href="http://www.ereleases.com" rel="nofollow ugc">ereleases.com</a> for commissioning this plugin and letting me share it with the community. Thanks, guys. You rock!
Lots of thanks to Andrew Kurtis from WebHostingHub Support for providing the Spanish translation.
<h3>Filters</h3>
Filters can really come in handy to nail down specific customizations on a site by site basis. I am what you would consider a power user so I’m a big fan of actions and filters and try to incorporate them into my plugins as much as possible. Here are some pretty helpful filters to get your authors autocomplete meta box working just the way you like.
<h4>authors_autocomplete_mb_allow_user_id</h4>
This filter allows you to block users from the autocomplete results according to user id. Return true to allow and false to deny.
It passes the user id, along with the post ID and post type. Don’t forget: when using a filter, you MUST return something. Here’s an example to help you get started:
<pre><code><?php

// return *true* to allow the user and *false* to deny the user from autocomplete results
add_filter( 'authors_autocomplete_mb_allow_user_id', 'filter_authors_autocomplete_mb_allow_user_id', 1, 4 );
function filter_authors_autocomplete_mb_allow_user_id( $allow_user_id, $user_id, $post_id, $post_type ) {
 if ( $user_id == 4 )
 return false;
 return $allow_user_id;
}
?>
</code></pre>
<h4>authors_autocomplete_mb_allow_user_role</h4>
This filter allows you to block users from the autocomplete results according to user role. Return true to allow and false to deny.
It passes the user role, along with the post ID and post type. Don’t forget: when using a filter, you MUST return something. Here’s an example to help you get started:
<pre><code><?php

// return *true* to allow the user and *false* to deny the user from autocomplete results
add_filter( 'authors_autocomplete_mb_allow_user_role', 'filter_authors_autocomplete_mb_allow_user_role', 1, 4 );
function filter_authors_autocomplete_mb_allow_user_role( $allow_user_role, $user_role, $post_id, $post_type ) {
 if ( $user_role == 'administrator' )
 return false;
 return $allow_user_role;
}
?>
</code></pre>
<h4>authors_autocomplete_mb_author_capability</h4>
When checking to see if a user has author privileges, and should therefore be included in the autocomplete results, the plugin checks the user’s capabilities. If the user is editing a page, then the user is added if they have the capability to edit_pages, otherwise the user is added if they have the capability to edit_posts.
If you would like to change the author privilege capability, then this filter is for you. It passes the default capability, along with the post ID and post type. Don’t forget: when using a filter, you MUST return something. Here’s an example to help you get started:
<pre><code><?php
// changing the author capability according to post type
add_filter( 'authors_autocomplete_mb_author_capability', 'filter_authors_autocomplete_mb_author_capability', 1, 3 );
function filter_authors_autocomplete_mb_author_capability( $author_capability, $post_id, $post_type ) {
 if ( $post_type == 'movies' )
 return 'edit_movies';
 return $author_capability;
}
?>
</code></pre>
<h4>authors_autocomplete_mb_custom_user_search_user_ids</h4>
Want the autocomplete box to search information besides the default user_login, display_name and user_email? This is the filter for you.
Use this filter to run whatever search you like and simply return the user IDs from your results.
It passes a blank array to get you started, the search term, post ID and post type. Don’t forget: when using a filter, you MUST return something.
Here’s an example from me helping a user search their <a href="https://wordpress.org/plugins/cimy-user-extra-fields/" rel="ugc">CIMY User Extra Fields</a>:
<pre><code><?php
// search CIMY User Extra Fields with search term and return user IDs
add_filter( 'authors_autocomplete_mb_custom_user_search_user_ids', 'authors_autocomplete_custom_user_search', 1, 4 );
function authors_autocomplete_custom_user_search( $user_ids, $search_term, $post_id, $post_type ) {
 global $wpdb;
 return $wpdb->get_col( "SELECT users.ID, cimy_uef_data.VALUE FROM $wpdb->users users LEFT JOIN {$wpdb->prefix}cimy_uef_data cimy_uef_data ON cimy_uef_data.USER_ID = users.ID WHERE ( cimy_uef_data.VALUE LIKE '%$search_term%' OR users.user_login LIKE '%$search_term%' OR users.display_name LIKE '%$search_term%' OR users.user_email LIKE '%$search_term%' ) ORDER BY users.ID ASC" );
}
?>
</code></pre>

Authors Autocomplete Meta Box

Looks like this plugin hasn't been updated for a long time, however it still seems to work really nicely. Great little plugin for sites that have an emphasis on author based content. If you need admins to be able to easily assign authors without dealing with a cumbersome dropdown of every single user, then this is awesome for that.



Still seems to work

Replaces the default WordPress Author dropdown with a meta box that allows you to select the author via Autocomplete.

Noindex Author vs Authors Autocomplete Meta Box