The Harvard Department of Psychology (together with the Department of Social Relations, which was folded into it) was home to some of the most eminent psychologists in history, including the founder of the field in the United States, one of the first women in experimental psychology (she invented "paired associate learning"), a Nobel laureate, two icons of the 1960s counterculture, the originators of the terms "identity crisis," and "six degrees of separation," and one of the twentieth century's pioneers in neuroscience. These biographical sketches of historic Harvard were written by Rebecca Sutherland and Steven Pinker.