Dr. Aristotelis Kalyvas is an Assistant Professor of Neurosurgery at the National and Kapodistrian University of Athens and a practicing attending neurosurgeon at Attikon University Hospital, specializing in pituitary, skull base, and brain tumor surgery. His expertise encompasses both endoscopic and open techniques for skull base pathologies, as well as advanced multiparametric brain mapping for gliomas and complex intra-axial brain tumors.

From 2021 to 2025, Dr. Kalyvas served as a staff neurosurgeon at University Health Network (UHN) and Assistant Professor at the University of Toronto. He previously completed a structured two-year clinical fellowship (2019–2021) at Toronto Western Hospital and the University of Toronto, focusing on complex intra-axial tumors and both surgical and radiosurgical management of pituitary and skull base pathologies. He earned his MD from the University of Ioannina, followed by his neurosurgical residency at the University of Athens, Greece. He holds an MSc in Surgical Sciences from the University of Edinburgh, UK, and a PhD in structural brain connectivity from the University of Athens.

An advocate for education, Dr. Kalyvas organizes training courses aimed at deepening surgeons’ understanding of critical white matter pathways. Notable examples include the NeuroConnect International Course in Toronto and the Athens White Matter Dissection Course. NeuroConnect has been recognized with an educational award by the American Association for Anatomy. In recognition of his dedication to teaching, he also received the Fellowship Teaching Award from the Division of Neurosurgery at the University of Toronto in 2021 and the Education Fund from the University of Toronto in 2023.

Dr. Kalyvas’ research interests include structural brain connectivity, brain mapping, and clinical research/trials for brain, skull base, and pituitary tumors. He has authored over 100publications, with 27 original articles dedicated to brain connectivity research. His work has been presented at numerous national and international conferences, earning him sevenawards. He is currently exploring the use of high-intensity focused ultrasound (HIFU) and liquid biopsies in brain tumor diagnostics and is developing multiparametric brain mapping protocols for patients with gliomas.

Dr. Kalyvas is an Executive Committee Member of the CNS/AANS Tumor Section, contributing to advancements in neuro-oncology.