In 1930, he was appointed director of the newly opened Harvard Neurological Unit at Boston City Hospital. When Cobb moved to the Massachusetts General Hospital in 1934, he was succeeded by Tracey Putnam.
Cobb's appointment as director of the Harvard Neurological Unit at Boston City Hospital in 1930 led to a change in leadership when he transferred to Massachusetts General Hospital in 1934 and was succeeded by Tracey Putnam.