Overbrook Foundation

Overbrook Foundation

Frank and Helen Altschul founded the New York-based Overbrook Foundation in 1948, embedding it within a family ecosystem that includes the investment entity Overbrook Management Corporation. Frank Altschul was a prominent banker and his son, Arthur Altschul, later became a General Partner at Goldman Sachs, cementing a multi-generational presence in both finance and philanthropy. Today, Arthur G. Altschul Jr. serves as Vice-Chair and Treasurer, while Eric Weingartner operates as President and CEO. The foundation pursues a dual mandate: a grant-making program focused on environment and human rights, primarily in the United States and Latin America, alongside a diversified investment portfolio that funds that mission and operates with the posture of an institutional asset owner. Its strategy covers venture capital, growth equity, buyouts, distressed debt, secondaries, and fund commitments. While specific portfolio company names are not publicly disclosed, the foundation's capital is deployed alongside a network that includes the Altschul family-led closed-end fund General American Investors, where Arthur Altschul Jr. also serves on the board. Overbrook Management Corporation co-locates at 280 Park Avenue, managing an undisclosed pool of endowment assets across strategies including natural resources, mezzanine, and venture debt. The foundation has granted over $240 million since inception. Daniel R. Katz, a co-founder of Rainforest Alliance, leads the environmental program from the foundation's office at 60 East 42nd Street — an example of how operating experts are embedded directly into the grant-making architecture. In recent years, the foundation has continued to deploy capital through its dual structure, with no disclosed changes to its core leadership or investment mandate. The Overbrook Foundation's structural differentiator is the integration of a professional grant-making entity with a separate but closely aligned family investment corporation, Overbrook Management Corp., both governed by a third generation of the Altschul family. This lets the philanthropy maintain a risk-tolerant, multi-asset endowment portfolio without outsourcing its investment management or diluting family control.