March 20, 1904Â – Behaviorist, inventor and philosopher B. F. Skinner is born in Susquehanna, Pennsylvania. He is best known for his theories on human behavior, which emphasized lack of free will and conditioning by repeated experience. He was also an inventor: his innovations included an automated “teaching machine” and a pigeon-guided missile. He wrote a number of books for the general audience, most notably Walden Two (which outlined an experimental community based on his theories) and Beyond Freedom and Dignity. He was the American Humanist Association’s Humanist of the Year in 1972. Skinner died in 1990, aged 86.