Dr. Aristotelis Kalyvas is a staff/attending neurosurgeon at Toronto Western Hospital and Assistant Professor at the University of Toronto, specializing in pituitary, skull base, and brain tumor surgery. He employs both open and endoscopic techniques for skull base pathologies and multiparametric brain mapping for intra-axial tumors. Dr. Kalyvas' research interests include structural brain connectivity, brain mapping, and clinical trials/research for brain, skull base, and pituitary tumors.