Ralph Waldo Emerson was an influential American essayist and poet in the 19th century who led the Transcendentalist movement. He published influential essays and gave over 1,500 lectures promoting ideas of individualism and criticism of social pressures. Some of his most famous works include Nature, The American Scholar, and essays in his First and Second Series collections. Emerson developed ideas around individuality, freedom, and the relationship between the soul and nature. Though his writing was complex, Emerson had a profound influence on American thinkers and remains an important figure in American intellectual history.