In 1987, I published the first book in the field of Human Paleopsychology. This approach is premised on two basic assumptions: First, human beings have an ancient and rich evolutionary history, and second, that ancient history is thoroughly involved in everything we feel, think and do personally, politically and morally. According to famed neuroscientist Paul MacLean, the human brain is composed of a primeval reptilian segment at the lowest level, a mammalian segment at mid-level and a human or neocortical segment at the highest level. I added the notion that we human beings are constantly “regressing down” or “progressing up” MacLean’s triune brain system in the natural flow of behavior.