$args = array(
   'author=' => $curauth->ID,
    'orderby' => 'author',
    'order'   => 'DESC',
   'posts_per_page' => -1,
);
$author_query= new WP_Query( $args );

<?php
$args = array(
   'author=' => $curauth->ID,
   'orderby' => 'author',
   'order'   => 'DESC',
   'posts_per_page' => -1,
);
$author_query= new WP_Query( $args );
// Get the authors from the database ordered by user nicename
global $wpdb;
$site_admin = ""; // enter Admin ID to exclude
$query = "SELECT ID, user_nicename from $wpdb->users WHERE ID != '$site_admin' ORDER BY user_nicename";
$author_ids = $wpdb->get_results($query);
 
// Loop through each author
foreach($author_ids as $author) :
// Get user data
$curauth = get_userdata($author->ID);
// Get link to author page
$user_link = get_author_posts_url($curauth->ID);
?>
<ul id="sev">
<?php $author_query = new WP_Query( 'author='.$curauth->ID.'&posts_per_page=-1&showposts=1' );
while ( $author_query->have_posts() ) : $author_query->the_post(); ?>
<div class="author-images"><?php echo get_avatar(get_the_author_meta('user_email'),'50'); ?></div>
<li class="author-nick"><?php echo $curauth->nickname; ?></li>
<li class="author-aciklama"><?php the_author_meta('description'); ?></li>
<li class="author-yazi"> <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a>
<?php endwhile; wp_reset_postdata(); ?></li>
</ul>
<?php endforeach; ?>