American essayist, poet, and practical philosopher, Henry David Thoreau was a New England Transcendentalist and author of the book Walden.
Henry David Thoreau was born on July 12, 1817, in Concord, Massachusetts. He began writing nature poetry in the 1840s, with poet Ralph Waldo Emerson as a mentor and friend. In 1845 he began his famous two-year stay on Walden Pond, which he wrote about in his master work, Walden. He also became known for his beliefs in Transcendentalism and civil disobedience, and was a dedicated abolitionist.