If I am correct, Ralph Waldo Emerson (Normally called "Waldo") was an American essayist, lecturer, philosopher, and poet who led the transcendentalist movement.
Answer: Ralph Waldo Emerson, (born May 25, 1803, Boston, Massachusetts, U.S.—died April 27, 1882, Concord, Massachusetts), American lecturer, poet, and essayist, the leading exponent of New England Transcendentalism.
