Hi,
From the documentation here is how to List Posts By A Co-Author
https://vip.wordpress.com/documentation/list-posts-by-a-co-author/
List Posts By A Co-Author
When using Co-Authors Plus, you may want to create a listing of all posts by a given co-author. Co-Authors Plus deviates slightly from how core WordPress works in that it stores byline information in a custom ‘author’ taxonomy. It works in this manner because a post (let it be a Post, Page, or Custom Post Type) can have multiple taxonomy terms associated with it.
To list some or all posts from a co-author, you’ll want to create a new WP_Query object based on the author term for a given user or guest author. Here’s an example of what that might look like:
// Build the query arguments
$args = array(
'post_type' => 'post',
'posts_per_page' => 10,
'post_status' => 'publish',
'author_name' => $user_login,
);
$author_query = new WP_Query( $args );
if ( $author_query->have_posts() ) :
while ( $author_query->have_posts() ) : $author_query->the_post();
// Do your presentation
endwhile;
endif;
Where $user_login should be the user’s slug. In my case:
$curauth = (isset($_GET['author_name'])) ? get_user_by('slug', $author_name) : get_userdata(intval($author));
'author_name' => $curauth->user_login,