“van der Horst’s treatment of the cross-fertilization of ideas—as well as the personal and professional relationships that went into their making—is commendable. Given our own contemporary interest in the promises and pitfalls of interdisciplinarity, it emphasizes the many gains that can emerge out of an active commitment to talk across disciplines. With its focus on a series of important attempts to merge the goals of the psychological and the natural sciences, van der Horst’s book should equally interest historians of ethology, biology, psychology, psychoanalysis, and the human sciences more broadly. Despite the complex nature of the story that it tells, this book is highly accessible and well suited to nonspecialists and specialists alike." (Journal of the History of the Behavioral Sciences, 2 October 2013) “Overall, this book, although somewhat cost-prohibitive, does a very good job of helping to contextualize the development of attachment theory and would be useful reading for both clinicians and researchers at all levels of understanding regarding attachment theory. I agree with Jerome Kagan that this is a ‘‘coherent, gracefully written, even-handed, and richly detailed description.”  (Journal of Marital and Family Therapy, 1 October 2012) “Nonetheless, for those interested in the history of psychology, and attachment theory in particular, I recommend John Bowlby: From Psychoanalysis to Ethology for what it tells us about the origins of attachment and John Bowlby’s courageous forging of attachment theory.”  (PsycCRITIQUES, 2 May 2012) "... (this book)does a very good job of helping to contextualize the development of attachment theory and would be useful reading for both clinicians and researchers at all levels of understanding regarding attachment theory. I agree with Jerome Kagan that this is a "coherent, gracefully written, even-handed, and richly detailed description"." (Journal Marital and Family Therapy, October 2011)