Author Not Showing on Listing

Is it correct, in the detail page it isn’t showing the author.
You can tweak it by adding this

<br>Listed by <?php the_author(); ?><br>

where you want, in the template.
Try to add it at the row 355 of the geodirectory_template_actions.php in wp-content/plugins/geodirectory
right after

<p class="geodir_post_taxomomies clearfix">  

It will place the author above the Place categories (below the slideshow).

I would add this as a function, so that it doesn’t get overwritten by theme updates. Add this to your child theme’s functions.php

add_action( 'geodir_details_main_content', 'my_show_author_mod', 45 );
function my_show_author_mod() {
	$myauthor = get_the_author();
	$myauthorlink = get_author_posts_url( get_the_author_meta( 'ID' ) );
	echo '<p class="clearfix">Listed by <a href="' .$myauthorlink . '">' . $myauthor . '</a></p>';
}

Hope that is ok for you 🙂