Display query output in two columns?

Is there a way to modify this code so that the title list displays in two columns? Preferably not a method that depends on CSS.

function list_posts_by_taxonomy( $post_type, $taxonomy, $get_terms_args = array('exclude' => array(4, 15, 17, 18, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 86, 87, 88, 89)), $wp_query_args = array() ){
	$tax_terms = get_terms( $taxonomy, $get_terms_args );

	if( $tax_terms ){
		foreach( $tax_terms  as $tax_term ){
			$query_args = array(
			'post_type' => $post_type,
			"$taxonomy" => $tax_term->slug,
			'post_status' => 'publish',
			'posts_per_page' => -1,
			'orderby'=> 'name',
			'order' => 'ASC',
			'ignore_sticky_posts' => true
			);
			$query_args = wp_parse_args( $wp_query_args, $query_args );

			$my_query = new WP_Query( $query_args );
			if( $my_query->have_posts() ) {
				?>

				<h2 id="<?php echo $tax_term->slug; ?>" class="tax_term-heading"><?php echo $tax_term->name; ?></h2>
				<ol class="taxonomy-list">
				<?php while ($my_query->have_posts()) : $my_query->the_post(); ?>

				<?php if(strpos(get_the_title(), 'Anthology') === false) { ?>
					<li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a>
					<?php $terms = get_the_terms( $post->ID , 'series' );
					if($terms) {
						foreach( $terms as $term ) {
							if ( $term->description !== '' )  {
								echo '(' . $term->description . ') ';
							}
						}
					}
					?>
					</li>
					<?php } ?>
				<?php endwhile; ?>
				</ol>
				<?php
			}
			wp_reset_query();
		}
	}
}

I tried modifying this code, but I can’t seem to get it too work.