Viorst is a 1952 graduate of the Newark College of Arts and Sciences at Rutgers University in Newark, New Jersey. In 1968, Viorst signed the "Writers and Editors War Tax Protest" pledge, vowing to refuse tax payments in protest against the Vietnam War. In the latter part of the 1970s, after two decades of writing for children and adults, she turned to the study of Freudian psychology. In 1981, she became a research graduate at Washington Psychoanalytic Institute after six years of study.