As my experience suggests, specialists in a given field tend to frown on those who, for whatever reason, stray onto their turf. Like the white blood cells that protect our bodies from foreign invaders, they repel all “alien” forces. Those who proceed undaunted may find, in the end, that the authorities have relented, and that their admittance has been tacitly approved…but in the beginning at least the road is bound to be rocky. The narrower and more specialized the field, I have found, the prouder the authorities tend to be and the stronger their antipathy to outsiders.