Essential interview in Forbes with Dr. Walter Sinnott-Armstrong. Posted on January 28, 2019February 19, 2019 by Walls: Knocking Down The Barriers That Divide Us Loading... Taking too long? Reload document | Open in new tab https://www.forbes.com/sites/rodgerdeanduncan/2019/01/23/walls-knocking-down-the-barriers-that-divide-us/#3ba0d30d5dc1