Positions Available The success of this page depends on your involvement, so please get in touch! To list your job opening on this page, write the MBNA or contact us at mbna@nas.com. We will attempt to keep listings current; please notify us if you are aware of any changes to a listing. For nurse practitioners, nationwide job listings are available on jobs@nurse.net. A more general job-listing web site is at http://www.careermachine.com.