Henry David Thoreau
Henry David Thoreau (1817–1862) was an American naturalist, essayist, and radical thinker whose work bridged American transcendentalism and environmental philosophy while pioneering the practice of civil disobedience. Born in Concord, Massachusetts, educated at Harvard, and influenced by Emerson, Thoreau undertook his famous two-year experiment in simple living at Walden Pond (1845–1847), which he chronicled in Walden (1854). His essay 'Civil Disobedience' (1849), written after his arrest for refusing to pay taxes supporting slavery and the Mexican-American War, articulated a philosophy of principled nonviolent resistance that later inspired Mahatma Gandhi and Martin Luther King Jr. Thoreau's passionate advocacy for wilderness preservation, his critique of capitalist accumulation and industrial society, his philosophical naturalism, and his vision of a simplified, morally deliberate life established him as a foundational figure in American environmentalism and anarchist political thought.