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<a href="<?php echo get_author_posts_url( $author_id, get_the_author_meta( 'user_nicename' ) ); ?>">
<?php the_author(); ?>
</a>

/* OU */

<?php the_author_posts_link(); ?>

$author_id = get_the_author_meta('ID');

get_user_meta( $author_id )['description'][0];

$author_image = get_user_meta( $author_id, 'qd_user_image', true );

// Pega a imagem inserida para o custom field
if ( $author_image ) {
  echo '<img src="'. $author_image .'" />';

// Pega a imagem do Gravatar
} else {
  echo get_avatar( $author_id, 128 );
}