Dr. Mark D. Calayag

Gabriel Zada, MD, MS, FAANS, FACS, is Professor of Neurological Surgery, Otolaryngology, and Physiology & Neuroscience at the Keck School of Medicine of USC and an internationally recognized leader in brain, skull base, and pituitary tumor surgery. He serves as Vice Chair of Education and Residency Program Director, Surgical Director of the USC Brain Tumor Center, and Director of the USC Endoscopic Skull Base Surgery Program.Dr. Zada has performed more than 3,000 cranial operations, specializing in minimally invasive and endoscopic approaches for brain, pituitary, and skull base tumors. He completed fellowship training under Dr. Edward Laws at Harvard/Brigham and Women’s Hospital and advanced training under Dr. Paolo Cappabianca in Naples, Italy.An NIH-funded investigator, Dr. Zada has authored more than 400 peer-reviewed publications and 3 surgical textbooks. He is Editor of *Neurosurgical Focus* and President-Elect of the AANS/CNS Joint Section on Tumors. FindExpertMD ranks him the **#1 neurosurgeon in California for pituitary tumors, meningiomas, skull base neoplasms, and neuroendoscopy**. He has treated patients from around the world including Mexico, Guam, Hawaii, Europe. South America, and Canada. Dr. Zada is highly rated in 44 conditions, according to our data. His clinical expertise encompasses Pituitary Tumor, Hypothalamic Tumor, Brain Tumor, Endoscopic Transnasal Transsphenoidal Surgery, and Gamma Knife Radiosurgery. Dr. Zada is board certified in American Board Of Neurological Surgery.

Joffre Olaya is a Neurosurgery specialist and a Pediatric Neurologist practicing medicine in Orange, California. Dr. Olaya is highly rated in 58 conditions, according to our data. His clinical expertise encompasses Batten Disease, CLN1 Disease, CLN5 Disease, Deep Brain Stimulation, and Posterior Fossa Decompression. Dr. Olaya is currently accepting new patients.

Shafali Jeste is a Pediatric Neurologist practicing medicine in Los Angeles, California. Dr. Jeste is highly rated in 7 conditions, according to our data. Her clinical expertise encompasses Autism Spectrum Disorder, Tuberous Sclerosis Complex, Tuberous Sclerosis, and Cortical Dysplasia.