In 1796, Van Buren started working in the law office of Francis Sylvester, an attorney that worked in Kinderhook. He kept the office clean, copied documents and did other jobs. While he was working there, he learned about law. After six years under Sylvester, he spent a final year of apprenticeship in the New York City office of William P. Van Ness. Van Buren passed the New York State Bar Exam in 1803, and became a lawyer.