It’s actually pretty easy! You just need to set up a quick loop…
Here is the very simplified version:
<?php
query_posts('post_type=staff && department=YOURDEPARTMENTHERE');
while (have_posts()) : the_post();
// echo the staff member's values that you want displayed
endwhile;
?>
Just swap out YOURDEPARTMENTHERE with the department you want to target. Here’s an example from my project, each run through the loops spits out a division (for easy styling) which contains the specific staff members name, picture, and an excerpt of their bio:
<?php
query_posts('post_type=staff&&department=a');
while (have_posts()) : the_post();
echo '<div class="staff">';
echo '<h3><a href="';
the_permalink();
echo '">';
the_title();
echo '</a></h3>';
the_post_thumbnail ( 'medium', array ('class' => 'alignleft') );
the_excerpt();
echo '</div>';
endwhile;
?>
I hope this helps you!!