Elizabeth Fivaz Depeursinge is a former professor of clinical ethology at the University of Lausanne School of Medicine, where she was president of the Centre for Family Studies and head of its research department. She was a practicing child analyst and family therapist before moving into clinical research. She is co-author of The Primary Triangle: A Developmental Systems View Of Fathers, Mothers, And Infants, a book proposing an original scenario by which to understand and treat the family unit. Integrating developmental and systems theories, the book deals with the mother-father-infant “primary triangle” and provides a complex research paradigm for examining the interactional triangles formed in the family during the early years. Fivaz Depeursinge is also co-author of the book The Baby and the Couple: Understanding and treating young families. Expanding the seminal studies of The Primary Triangle, the book provides an insider’s view on how infant communication develops in the context of the family and how parents either work together as a team or struggle in the process.