Neurosurgical Specialists

Leading Spine Surgeons and Brain Surgeons

Mark Liker M.D., F.A.A.N.S., F.A.C.S.

Mark Liker M.D., F.A.A.N.S., F.A.C.S.

Neurosurgeon/Spine Surgeon

Dr. Liker, founding and senior partner at California Neurosurgical Institute, is a board-certified and accomplished neurosurgeon with a broad range of technical and clinical expertise mastering both complex open and minimally invasive spine surgery, complex brain surgery, functional neurosurgery, stereotactic neurosurgery and radiosurgery. This perspective provides him with the insight and experience to identify the most appropriate and effective methods of treating the full variety of spinal and brain disorders.

Dr. Liker earned a degree in mechanical and aerospace engineering from Princeton University in 1987 where he also completed requirements for medical school matriculation. After graduation Dr. Liker was employed on “Wall Street” for four years in a variety of investment banking and corporate finance positions and earned the prestigious Chartered Financial Analyst designation. However, his true calling drove him to return to the pursuit of a medical degree and in 1995 he graduated Summa Cum Laude with distinction in research from the State University of New York. He was fortunate to have trained at USC Keck Medical Center and Los Angeles County Medical Center where he also earned a fellowship in complex spine surgery.

Dr. Liker continues to pursue academic research as well as an assistant professor and faculty member at USC Keck Medical Center where he directs the Center for Deep Brain Stimulation. Over the course of his career, he has authored over 40 peer-reviewed manuscripts and chapters and has given over 40 national and international invited presentations on a variety of neurosurgical topics.

Please read further on Dr. Liker and his extensive training on DBS by visiting USC Center for Deep Brain Stimulation

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Parham Yashar M.D.

Parham Yashar M.D.

Neurosurgeon/Spine Surgeon

Dr. Yashar joined the California Neurosurgical Institute after completing his fellowship and residency in 2012. With his broad experience, interest, and accomplishments in Spine, Brain, and Neuro-Interventional procedures, Dr. Yashar has become a preeminent Neurosurgeon in Los Angeles and an integral Partner at CNI.

Dr. Yashar is a Summa Cum Laude graduate from UCLA, where he received his Bachelor of Science with both High Honors and Departmental Distinction in Cybernetics. Dr. Yashar then attended The Feinberg School of Medicine of Northwestern University. He completed his residency in Neurological Surgery at LAC+USC Medical Center/Keck School of Medicine and an international recognized Endovascular Fellowship under the mentorship of Dr. L. Nelson Hopkins and Dr. Elad I. Levy, at the University at Buffalo (SUNY-Buffalo) in Upstate New York.

Dr. Yashar strives to achieve the best for each and every patient he treats. He recognizes that every patient is unique and is committed to treating each with compassion and empathy, through every step of the treatment process.

Bjorn Lobo, M.D.

Bjorn Lobo, M.D.

Neurosurgeon/Spine Surgeon

Dr. Lobo is a neurosurgeon who specializes in the treatment of brain tumors that arise from the base of the skull and the pituitary gland. He also treats patients with brain aneurysms, hydrocephalus, Chiari malformations and spinal disorders.

Dr. Lobo has a very simple philosophy in his medical practice: treat every patient as if they were a family member. He understands that dealing with neurological illnesses is often an uncertain time in an individual’s life and that many of these illnesses can be painful and debilitating. However, good results are often achieved when the patient and doctor work together as a team. Thus, after obtaining a comprehensive history of the illness from the patient, he likes to break down how specific treatments, including non-surgical management, may alleviate symptoms and then makes the decision together with the patient about the best course of treatment. If a surgical course is decided upon, he utilizes the most cutting edge technologies to provide precision care.

Dr. Lobo grew up in Ohio and went to the Northeastern Ohio Universities College of Medicine where he completed the rigorous BS/MD program, which is one of only six programs in the country that accelerates undergraduate and medical school into a six-year period. He then completed his residency in Neurological Surgery at the Cleveland Clinic Foundation, one of the top four hospitals in the country. While at the Cleveland Clinic, he also completed a two-year fellowship focused on the treatment of complex brain tumors arising from the base of the skull. Spurred by his passion to be technically innovative in all aspects of skull-base surgery, Dr. Lobo then completed an additional one-year fellowship in minimally invasive and endoscopic skull base surgery at the John Wayne Cancer Institute in Santa Monica.

Dr. Lobo is currently seeing patients at his offices in Northridge and Valencia.

Maureen Aoys PA-C

Maureen Aoys, DC, MS, PA-C

Certified Physician Assistant

Maureen Aoys, DC, MS, PA-C is a board-certified physician assistant with surgical experience in Cosmetic/Plastics, Laparoscopic Gastric Banding, and now Neurosurgery. She has a Master of Science in Physician Assistant Studies from Western University of Health Sciences.

Ms. Aoys graduated from the University of California, Los Angeles with a Bachelor of Science degree in Kinesiology and Psychology. She received her Doctor of Chiropractic degree from the Los Angeles College of Chiropractic.

As well as working in private practice as a Doctor of Chiropractic, Ms. Aoys was an Assistant Professor and clinical supervisor at the Southern California University of Health Sciences teaching clinical and diagnostic skills to chiropractic students for 11 years.