Dr. Mark Howard Ellis specializes in allergy/immunology in Orange area. Dr. Mark Howard Ellis has a medical practice at 455 South Main Street, Orange CA, and has over 36 years of experience in the field of medicine. He graduated from Tulane University School Of Medicine with his medical degree in 1981. Dr. Ellis is accepting new patients at his medical office and practice location in Orange, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.