Description. About the Alliance:. The Prospect Park Alliance is a non-profit organization that sustains, restores and advances Prospect Park for the benefit of diverse communities, in partnership with the City of New York. Prospect Park is Brooklyn's flagship park and a National Historic Landmark, designed by Frederick Law Olmsted and Calvert Vaux. The Alliance cares for the natural environment, preserves historic design and serves the community by providing public programming and Park amenities for the Park, which receives more than 10 million visits each year. The Alliance’s work in historic... view job details