development of aneurysm clipping
development of the Cushing reflex
development of ventriculography
first use of operating microscope in neurosurgery
pioneered modern neurosurgical techniques
first successful separation of conjoined twins (1987)
brain tumor surgery
spinal surgery
neuro-oncology
neurocritical care
epilepsy surgery
pediatric neurosurgery
functional neurosurgery
vascular neurosurgery
pituitary surgery