His patients gave him an average rating of 4.5 out of 5 stars. Dr. Leff's areas of expertise consist of asthma, alzheimer's disease, and allergies. He is in-network for Blue Cross/Blue Shield, Coventry, and Viant, as well as other insurance carriers. He studied medicine at Des Moines University, College of Osteopathic Medicine. He is professionally affiliated with Atlantic Medical Group and Overlook Medical Center.