Dr. William R Halloran specializes in psychiatry in Chico area. Dr. William R Halloran, MD has a medical practice at 130 Amber Grove Drive, Suite 130, Chico CA, and has over 37 years of experience in the field of medicine. He graduated from his medical school with his medical degree in 1980. Dr. Halloran is accepting new patients at his medical office and practice location in Chico, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.