How wonderful being a former neighbour of Byron Katie! Prof. Dan Siegel's most popular book is: Mindsight: The New Science of Personal Transformation.
I'm currently re-reading the works of Stephen W. Porges on Polyvagal Theory, which outlines the area of autonomic system regulation and its role in human behaviour. In short, our early attachment style influences how we relate to others as adults and interact with our environment. In other words, we are a product of our conditioning but have the power to change it through self-regulation.