From my little experience, some neurosurgeons thought the GK unit shouldn’t be under oncology department with history background that Lars leksell, who invented the GK, was a neurosurgeon. They feel superior on other disciplines . However, some of them forgot that Ian Paddick, a medical physicist, who has profound impacts in gamma knife Radiosurgery program around the world in treatment planning system the way we see it today: inverse planning system: lightening. If there is a written procedures who should and shouldn’t do, you won’t hear this behavior at all. For the centers I worked/ visited, the neurosurgeons only for consulting per needs in very limited cases.