Henry Thoreau was an American author, poet, philosopher, abolitionist, naturalist, tax resister, surveyor, and historian. He is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay Civil Disobedience, an argument for individual resistance to civil government in moral opposition to an unjust state. The crossword solutions for the term Henry Thoreau are DAVID, which is likely a reference to the biblical King David, who was renowned for his wisdom and courage.