This thesis examines Henry David Thoreau’s relationships with New England-based authors, publishers, and natural scientists, and their influences on his composition and professional development. The study highlights Thoreau’s collaboration with figures such as John Thoreau, Jr., William Ellery Channing II, Horace Greeley, and a number of correspondents and natural scientists. The study contends that Thoreau was a sociable and professionally competent author who relied not only on other major Transcendentalists, but on members from an array of intellectual communities at all stages of his career.