Dr. Mahler is an Emeritus Professor of Medicine at the 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 the Director of Respiratory Services. He received his medical degree from Loyola University Chicago Stritch School of Medicine. He specialized in internal medicine and pulmonary disease.