Oliver Napoleon Hill was an American self-help author and conman. He is best known for his book Think and Grow Rich (1937), which is among the best-selling self-help books of all time. Hill's works in…
Angela Duckworth, PhD, is a 2013 MacArthur Fellow and professor of psychology at the University of Pennsylvania. An expert in non-I.Q. competencies, she has advised the World Bank, NBA and NFL teams, …
