Henry David Thoreau spent almost his entire life in the village of Concord, Massachusetts, where he was born in 1817. After graduating from Harvard College in 1837, he developed a deep friendship with the writer and philosopher Ralph Waldo Emerson, the foremost figure in the Transcendentalist movement. Emerson’s emphasis on the cultivation of intuition and experience as keys to personal and social enlightenment profoundly influenced Thoreau. In 1845, Thoreau built a small cabin on a parcel of land Emerson owned near Walden Pond, where he lived for most of two years, seeking a new relationship to nature, society, and his own self. His experiences there are the raw material of his masterpiece, Walden, or Life in the Woods. Although he was first and last a writer and outdoorsman, Thoreau worked as a surveyor and handyman and was an active abolitionist and opponent of war and imperialism. He died in 1862 of tuberculosis. Bradley P. Dean, an independent scholar living in West Peterborough, New Hampshire, has written extensively on Thoreau's life and writings, and has edited two of Thoreau's previously unpublished booklength manuscripts.