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Led by Richard Kahan, The Urban Assembly is a non-profit organization dedicated to creating small, public, college-preparatory high schools that provide high quality education to students who would otherwise attend large, under-performing schools. By combining a rigorous course of study with authentic learning experiences and interaction with outside partners, UA schools offer students an academic experience that is challenging and relevant. UA has created a family of outstanding small schools led by accomplished principals and supported through partnerships with the public, private, and non-profit sectors.

Founded in 1967, the South Street Seaport Museum traces the history of the Port of New York, and its commercial and cultural impact on the city, the state, and the nation. New York’s premier maritime museum, South Street Seaport provides NYHS with essential teaching resources, including:

• The Lettie G. Howard, which is the school's full-time education vessel for the sailing season;
• Space in Schermerhorn Row for Marine Science and Harbor Humanities classes;
• Access to the waterfront for water quality testing and oyster gardening;
• Venues for boat-building, marine surveying, and vessel technology classes;

Led by Robert F. Kennedy, Jr., Waterkeeper Alliance empowers 150 local Waterkeeper programs to protect communities, ecosystems and water quality all over the world. There are six New York City area Waterkeeper programs. Waterkeeper’s philosophy shapes our academics and our students, who are informal Waterkeepers, ensuring the value of waterbodies for industry, government, recreation, travel, commerce and fishing.

In addition to these three Founding Partners, the Harbor School has collaborated with over 60 outside organizations to offer original theme related programming. Several of these partnerships are listed below:

• American Museum of Natural History
• Brooklyn Academy of Music
• Brooklyn College
• The Coach House Gallery
• Cornell Cooperative Extension
• College Summit
• The Coney Island Museum
• CUNY - The Graduate Center
• East River Apprenticeshop
• Floating the Apple
• Friends of Hudson River Park
• Governors Island Alliance
• Hudson River Community Sailing
• Hudson River Sloop Clearwater
• Kings Point Merchant Marine Academy
• Manhattan Sailing School
• Metropolitan Waterfront Alliance
• The Nature Conservancy
• New York Aquarium
• New York Water Taxi
• NY/NJ Baykeeper
• NY/NJ Harbor Estuary Program
• NYC DEP
• NYS DEC
• Scientific American
• Park Slope YMCA
• The Producers Project
• Police Athletic League
• The River Project
• Riverkeeper
• Rocking the Boat
• Regional Plan Association
• Seafarers Union
• Seaman's Church Institute
• SUNY Maritime
• The Urban Divers Estuary Conservancy
• NYU's Wallerstein Collaborative
• Working Waterfront Committee