Henry David Thoreau was a fascinating man, contributing vast amounts of information on nature history, leading the way for environmentalism. He also was a philosopher, abolitionist, anarchist, writer, poet, and a bit of a mystery. He is best known for his book 'Walden', and his essay on 'Civil Disobedience'. This early biography by Henry Salt is highly regarded by Thoreau scholars. - Summary by Phyllis Vincelli