Using wp_query to pull all entries under a custom post type

WP_query a custom posttype

<ul>	<?php
	$args3 = array(
		'post_type'     => array( 'investigators' ), //set post type
		'post_status'   => 'publish', // only pull published
		'field' 		=> 'slug', //searching on slug field
		'orberby' 		=> 'name', //order by name *ignored if using custom order by plugin, set in admin*
		'order'		    => 'DESC', //in descending order
		'posts_per_page'=> '-1', //show all

		//- - - - - - - - - -  - - -
		//'tax_query' => array(
			//'relation' => 'OR',
			//array(
			       //'taxonomy' => 'category',
			       //'field' => 'slug',
			       //'terms' => array( 'media coverage' )
			    //),

				//array(
				        //'taxonomy' => 'post_tag',
				        //'field' => 'slug',
				        //'terms' => array( 'featured-our-research' )
				    //)
		//)
	);
	$investigators_query = new WP_Query( $args3 );



	if ( $investigators_query->have_posts() ) {

	    while ( $investigators_query->have_posts() ) {

	        $investigators_query->the_post();

	            /// do stuff here
				echo'<li><a href="'; the_permalink(); echo'" rel="bookmark">'; the_title(); echo'</a></li>';

	    }
	}

	?></ul>
	<?php 	wp_reset_postdata();?>