Prospect Hill Foundation is an independent non-profit foundation based in New York, NY. Established in 1959, the mission of the foundation is to advance the human experience while ensuring the well-being of the earth. It was established in New York in 1959 by late Elizabeth G. Beinecke and William S. Beinecke. It makes grants in four areas, namely, environment, nuclear disarmament and non-proliferation, reproductive health and justice, and criminal justice. Additionally, it supports the philanthropic interests and activities of Beinecke family members through sponsored grants in the areas of arts and culture, environmental conservation, civic affairs, social services, and educational institutions. The assets of the foundation are managed and administered by the board of directors.Prospect Hill Foundation's investment portfolio is valued at over $70.39 million, with investments in private equity and cash.