Henry David Thoreau 
Walden, and On The Duty Of Civil Disobedience [PDF ebook] 

Henry David Thoreau was an American essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, and historian. A leading transcendentalist, Thoreau 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.