<?php
    $author_tags = get_transient( 'author_tags')
    if (!$author_tags) {
	    $tags = get_terms( 'post_tag', array(
	        'hide_empty' => 0
	    ));
	    if ( !empty( $tags ) && !is_wp_error( $tags ) ) {
		    $author_tags = array();ó
		    foreach ( $tags as $tag ) {
			    if(strpos($tag->slug,'author-') !== false) $author_tags[] = $tag;
		    }
		    set_transient( 'author_tags', $author_tags, 60 * 60 * 24);
	    }
    }
    ?>
    <?php if($author_tags): ?>
        <ul>
        <?php foreach ( $author_tags as $tag ): ?>
            <?php if(strpos($tag->slug,'author-') !== false): ?>
            <li><?php echo $tag->name; ?></li>
            <?php endif; ?>
        <?php endforeach; ?>
        </ul>
    <?php endif; ?>