page-authors.php

<?php
get_header();
if ( \PressbooksBook\Helpers\is_book_public() ) :
	if ( have_posts() ) {
		the_post();
	} ?>
			<div id="post-<?php the_ID(); ?>" <?php post_class( 'author-block-wrap' ); ?>>

				<?php
				$authors = get_posts(
					[
						'post_type' => 'back-matter',
						'suppress_filters' => false,
						'orderby' => 'menu_order',
						'order' => 'ASC',
						'tax_query' => [ // @codingStandardsIgnoreLine
							[
								'taxonomy' => 'back-matter-type',
								'field' => 'slug',
								'terms' => 'about-the-author',
							],
						],
					]
				);
				?>
				<h2 class="page-title">
				<?php
				if ( isset( $authors[0] ) ) {
					echo $authors[0]->post_title;
				} else {
					_e( 'Authors', 'pressbooks-book' );
				}
				?>
</h2>
				<!-- Author page info displayed if populated in Admin area -->
				<?php
				$i = 0;
				foreach ( $authors as $author ) :
					?>
					<div class="author-block">
						<?php
						if ( 0 !== $i ) :
							?>
<h3 class="author-name"><?php echo $author->post_title; ?></h3><?php endif; ?>
						<!-- Author Bio -->
						<div class="bio">
							<?php $the_content = apply_filters( 'the_content', $author->post_content ); ?>
							<?php echo $the_content; ?>
							<?php ++$i; ?>
						</div>
					</div>
				<?php endforeach; ?>
			</div><!-- #post-## -->

<?php else : ?>
	<?php get_template_part( 'private' ); ?>
<?php endif; ?>
<?php get_footer(); ?>