Donald A. Mahler, M.D., is Emeritus Professor of Medicine at Geisel School of Medicine at Dartmouth in Hanover, New Hampshire. Since October 2014, he works as a pulmonary physician at Valley Regional Hospital in Claremont, New Hampshire, where he is Director of Respiratory Services. To schedule an appointment with Dr. Mahler, call the Kane Center at Valley Regional Hospital 603 542-8603. Fax number: 603 542-1927.Valley Regional Hospital is designated as a Clinical Resource Center for the the Alpha-1 Foundation. Alpha-1 antitrypsin deficiency is a hereditary form of emphysema.