Peter Sterling, now retired from the University of Pennsylvania, is a well-known neuroscientist, having co-authored a popular text, Principles of Neural Design. He is a lifelong political activist, and historians of psychiatry may remember his public criticisms of psychiatric treatments in the 1970s, most notably of electroshock and antipsychotics. He could also be described as an ethnographer, as his travels among the indigenous people of Panama, where he now lives part-time, influenced his understanding of how the human brain was shaped in response to the demands of early hunter-gatherer societies. He is the author of a recent book titled, What is Health: Allostasis and the Evolution of Human Design. His books raises this provocative question: What does our species require for a healthy life? And can we achieve this with drugs?