This book explores the history of genetic determinist theories of mental illness, beginning in the nineteenth century and continuing right up to the present day. A century of research in the field of psychiatric genetics, from family studies to twin studies to adoption studies to genome-wide association studies, has produced no credible evidence of a strong genetic components to so-called "mental illnesses," no findings that help the human condition in any way, and in fact has caused great harm by diverting attention away from the well-established causes of these conditions, which have their roots in trauma and other adverse childhood experiences. This book also explores the long tradition of humanistic psychiatry and its great success in treating these conditions with an empathetic, client centered approach-a tradition that has been all but forgotten in the modern era of biogenetic explanations and drug-centered treatments for mental illness. Patrick D Hahn is an Affiliate Professor of Biology at Loyola University Maryland, USA, and a freelance writer. .