Walter E. Dandy is one of the true pioneers of modern neurosurgery. This eminence led many surgeons to visit his department for training. Mustafa Sakarya, a Turkish surgeon, was Dr. Dandy's only fellow from Turkey. He spent 9 months at the Johns Hopkins Hospital and wrote his observations in a notebook during this period. The notebook contains information regarding the patients, operative schedules, and surgical techniques, as well as theoretical reviews. His notes are of potential interest to both American and Turkish neurosurgeons.