'Unexpected Legacy' reports the findings of the California Children of Divorce Study, which began in 1971, a year after the nation's first no-fault divorce law was imposed in California. Wallerstein was the principal investigator on the study.
Speaking as the child of divorce, I have to say that one of the most disconcerting findings in 'The Longevity Project' focused on divorce: On average, grown children of divorced parents died almost five years earlier than children from intact families.