List Authors For Current Category

Execution of code goes to infinite loop because you missed the_post() in loop.

You can list all authors from current category:-

• Create an empty array for author IDs
• Check if current author ID exist in that array
• If No, display the author name and store that author ID in array.
• If Yes, Then skip that post and move to next.

Consider this example:-

<div class="container">
    <div class="row"><?php 

        if ( have_posts() ) { 
            $unique_authors = array();

            while( have_posts() ) { 
                the_post(); ?>

                <div class="col-md-2 text-center"><?php
                    if (!in_array(get_the_author_meta('ID'), $unique_authors)) {
                        the_author_meta( 'display_name' );
                        array_push($unique_authors, get_the_author_meta('ID'));
                    } ?>
                </div><?php 

            }
        } else { ?>
            <p class="text-center">No authors</p><?php
        } ?>

     </div>
</div>