Dr. Daniel Calnan

Dr. Calnan joined NeuroScience & Spine Associates in 2022. He is a fellowship-trained vascular neurosurgeon who has advanced training in brain surgery including aneurysms and interventional stroke treatment. He is the medical director of the Neuroendovascular Surgery Program at Lancaster General Hospital. Dr. Calnan oversees the program focused on treating vascular disorders of the brain and spine using minimally invasive endovascular techniques.


  • Medical School: Tufts University Medical School
  • Residency: Dartmouth-Hitchcock Medical Center
  • Fellowship: Cerebrovascular Neurosurgery: Dartmouth-Hitchcock Medical Center
  • Fellowship: Neuroendovascular Neurosurgery: University of Wisconsin-Madison


  • American Board of Neurological Surgery, candidate


  • Associate Member, Sigma Xi Research Society
  • American Medical Association
  • American College of Surgeons
  • Congress of Neurological Surgeons
  • American Association of Neurological Surgeons


  • Arteriovenous malformation
  • Brain aneurysms
  • Brain tumors
  • Carotid artery disease
  • Cerebral vascular disease
  • Dural arteriovenous fistula
  • Head and neck tumor embolization
  • Intracranial atherosclerosis
  • Stroke – interventional
  • Traumatic brain injury
  • Spine conditions (herniation, radiculopathy, trauma)