Dr. Jamal Julian Zaka, MD is a health care provider primarily located in WALNUT CREEK, CA, with other offices in Walnut Creek, CA and Martinez, CA. He has 22 years of experience. His specialties include Sleep Medicine, Critical Care Respiratory Therapy, Critical Care Medicine, Pulmonology. Dr. Zaka is affiliated with John Muir Medical Center Walnut Creek. He speaks English and Spanish.