Dr. Factor was born in Rhode Island and graduated from Brown University in Rhode Island and Mount Sinai School of Medicine in New York. He completed his Pediatric Residency at The Albert Einstein College of Medicine and the Montefiore Medical Center in New York. Dr. Factor went on to complete his Fellowship in Allergy and Immunology at The New York Hospital – Cornell Medical Center in New York.
Dr. Factor is Board Certified in Pediatrics and Allergy and Immunology. He is an Associate Clinical Professor of Pediatrics at the University of Connecticut School of Medicine and has hospital appointments at Connecticut Children's Medical Center, Hartford Hospital, Middlesex Hospital and Saint Francis Hospital and Medical Center.
Dr. Factor is the Division Head of Allergy and Immunology at the Connecticut Children's Medical Center and co-director of the Food Allergy Clinic at Connecticut Children's Medical Center. Dr. Factor founded, and is Medical Director of the New England Food Allergy Treatment Center, to desensitize patients with food allergies using oral immunotherapy. He is a past president of the New England Society of Allergy and is currently on the Executive Board of the Connecticut Allergy Society. Dr. Factor has volunteered his time at the American Lung Association's Camp Treasure Chest summer camp for asthmatic children in Connecticut. He helped establish a hospital asthma management program at Middlesex Hospital in Middletown, Connecticut and lectures frequently about allergic conditions, in particular, food allergies and asthma. Dr. Factor has been recognized in the Best Doctors in America and Connecticut Magazine's "Top Docs for Women."