In his book, "Walden; or Life in the Woods," American naturalist and author Henry David Thoreau explained that he left his life at Walden Pond after two years and two months because he felt he could not afford to spend more time there. From Walden Pond, Thoreau moved back to Concord, N.H.
In 1845, Thoreau built a small cabin in the woods near Walden Pond. He lived there in near isolation for over two years. Most of his time was spent observing nature, writing and reading. It was the most prolific period in his life for writing. While in the woods at Walden, Thoreau completed his first published book, "A Week on the Concord and Merrimack Rivers," which was written as a tribute to his older brother who had died three years earlier. Most of Thoreau's other books, published both in his lifetime and posthumously, were taken from his journal, in which he wrote his detailed activities, observations and thoughts. These books include his masterpiece, "Walden; or Life in the Woods."
Over time, Thoreau became a highly influential and respected author, naturalist and philosopher. He is well known for his transcendentalist philosophy. His work has continued to provoke and inspire even after his death in 1862.