Suffix post title with author nickname

How would I edit this code to suffix the post title with the author’s nickname (display name) AND keep the current post ID suffix as well?
Thanks Heaps

add_filter( 'the_title', 'gowp_post_id_title_suffix' ); // registers our action filter; the 2nd parameter is the name of the function we'll use to return the (possibly) updated title
function gowp_post_id_title_suffix( $title ) {
	global $post; // get the current post object
	if ( ( 'job_listing' == $post->post_type ) && in_the_loop() ) { // only apply our change to Posts while in the loop
		$title .= " #{$post->ID}"; // append the post ID to the title
	}
	return $title; // return the title, even if we haven't modified it
}