Surgeon (1869-1939) who pioneered many modern neurosurgical techniques and investigated the functions of the pituitary gland. Fountain pen signature, "Harvey Cushing,” on an off-white 5.5 x 3.5 postcard imprinted with his name and address at the Yale School of Medicine, addressed on the reverse in Cushing's hand. In very fine condition. Encapsulated in a PSA/DNA authentication holder.