WordPress hook and function to display various posts and custom post types on author pages

gistfile1.php

/*
 * Function for modifying the main query
 */
function modify_the_loop( $query ) {
	// Check that this is the main query, not a secondary one, and trigger if it's the author page'
	if ( $query->is_main_query() && $query->is_author() )
	{
		$query->set( 'post_type', array( 'post', 'page', 'CPT', 'CPT2' ) );
	}
}

add_action( 'pre_get_posts', 'modify_the_loop' );