Dr Louis is Empower360 Endowed Chair for Skull Base and Minimally Invasive Neurosurgery , Chief of the Division of Neurosurgery and Director of the Skull Base and Pituitary Tumor Program at the Pickup Family Neurosciences Institute at Hoag Memorial Hospital. His expertise includes endoscopic and minimally invasive treatment of benign and malignant brain tumors and skull base tumors. Through the use of cutting-edge neuroimaging and neuro-navigational equipment, he utilizes the concept of keyhole neurosurgery, minimizing the damage to surrounding brain, vascular and soft tissue structures. This approach has been demonstrated to decrease post-operative pain, minimize neurologic complications and shorten the length of hospitalization, resulting in better outcomes for his patients.