The Logic of Connection: How Evolution and Biology Create Caregiving and Attachment is a monograph about the logic of giving, love, trust, and nurturance. Bowlby's theory of attachment provides the best starting point for an explanation of nurturance, but there are some limitations in this theory, especially its tendency to dismiss the caregiving side of the relationship. The book examines the evolutionary evidence for nurturance and finds the origins of nurturance in the earliest mammalian emotions. In addition, it describes neurobiological research that has identified the brain circuits that underlie nurturance: a dyadic preference bond that is common to all mammals and a caring emotion that shows clear evolutionary development among mammalian species.

Married for Life is a book about life long marriage. The primary focus is on the healthy, happy marriages. Research is from a prospective longitudinal study of couples who married around the end of World War II and had two or three children. The couples and their families were interviewed at mid-life when their children were adolescents; the couples were interviewed again 25 years later. Home interviews included questionnaires, taped marital interaction (later coded), history each mate’s family experience growing up and their evaluations of their parents’ marriages, and discussions of the stresses and supports the couples faced in their own marriage as well as their ideas about the ingredients of a good marriage.