Van Buren was small in stature at tall and affectionately nicknamed "Little Van". When he began his legal studies, he wore rough, homespun clothing, causing the Silvesters to admonish him to pay greater heed to his clothing and personal appearance as an aspiring lawyer. He accepted their advice and subsequently emulated the Silvesters' clothing, appearance, bearing, and conduct. Despite Kinderhook's strong affiliation with the Federalist Party, of which the Silvesters were also strong supporters, Van Buren adopted his father's Democratic-Republican leanings. The Silvesters and Democratic-Republican political figure John Peter Van Ness suggested that Van Buren's political leanings constrained him to complete his education with a Democratic-Republican attorney, so he spent a final year of apprenticeship in the New York City office of John Van Ness's brother William P. Van Ness, a political lieutenant of Aaron Burr. Van Ness introduced Van Buren to the intricacies of New York state politics, and Van Buren observed Burr's battles for control of the state Democratic-Republican party against George Clinton and Robert R. Livingston. He returned to Kinderhook in 1803, after his admission to the New York bar.