Henry David Thoreau was an American naturalist, essayist, poet, and philosopher. A leading transcendentalist, he is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience", an argument for disobedience to an unjust state. Wikipedia

​

Thoreau was also a Surveyor who performed many surveys of the area surrounding Concord Massachusetts