Olmsted often clashed with the park commissioners, notably with Chief Commissioner Green.[120][124] Olmsted resigned in June 1862, and Green was appointed to Olmsted's position.[125][126] Vaux resigned in 1863 because of what he saw as pressure from Green.[127] As superintendent of the park, Green accelerated construction, though having little experience in architecture.[125] He implemented a style of micromanagement, keeping records of the smallest transactions in an effort to reduce costs.[124][128] Green finalized the negotiations to purchase the northernmost 65 acres (26 ha) of the park which was later converted into a "rugged" woodland and the Harlem Meer waterway.[125][128]