I am a "hard core" neuroscientist, having studied neural microcircuits in many brain regions, but especially the retina. My theoretical interest led me to write, with Simon Laughlin, Principles of Neural Design (2017). I am also a life-long social activist (Freedom Rider, 1961). Neuroscience and activism meet in my new book What is Health? Allostasis and the Evolution of Human Design (2020). My collected writings on the sociological and psychological bases for health and disease can be found here.