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ARNOLD ASSOCIATES, landscape architects and site planners established in Princeton & Trenton, NJ in 1971 by Henry Arnold (emeritus), has executed over 700 commissions. The Firm's work covers many various site conditions and client needs in the United States and abroad. Our disciplines cover a range including site layout, irrigation, drainage design, and vehicular and pedestrian circulation, grading and planting design. The Firm specializes in urban tree planting techniques for sustainable urban street trees. These disciplines have been applied in the context of urban spaces, parks, commercial, mixed use developments, residential, retail institutional and civic projects.

The office is a partnership organized to allow involvement of the Principal from the conceptual design to project completion. The policy of maintaining a highly trained in-house staff and associating with the best specialist consultants has proven an effective way to secure both economy of operation and excellence of design.

Past commissions vary in scale and complexity, ranging from major open spaces and memorials on the Washington, DC Mall, to the more restrictive design for a small interior plaza in Rockefeller Center, Manhattan. The large number of these projects that have been built and their durability provides a measure of the firm's effectiveness as rigorous professionals and artists.

About Us

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Stephen has managed and designed numerous national and international projects. Some of which include: Hoboken South Waterfront in New Jersey, Metrotech Center in Brooklyn, and the Korean War Veterans Memorial in Washington, DC. He is interested in the interface between people and environment, working to create richer urban living experiences. Working together with Henry Arnold since 1988, Stephen helped develop state-of-the-art renowned urban tree planting details and methods for sustainable tree growth.


Stephen graduated from Delaware Valley College as a bachelor of Ornamental Horticulture and a Masters of Landscape Architecture from Virginia Polytechnic and State University. He is a frequent lecturer and regularly teaches landscape architecture and planting design at various institutions.

HENRY F. ARNOLD, FASLA, Founding Principal Emeritus

Henry Arnold graduated from the University of Pennsylvania's School of Fine Arts with a bachelor of landscape architecture degree and studied forestry at Penn State. He has been practicing landscape architecture for nearly five decades—ten of those years were with the Vermont office of Dan Kiley as associate/partner landscape architect. He subsequently moved to Princeton, New Jersey, where he continues the practice of landscape architecture at Arnold Associates with his partner, Stephen Lederach. The firm's practice focuses on urban sites, with special expertise in developing and using new urban tree planting techniques.

Named a "Distinguished Artist" by the New Jersey State Council on the Arts, Arnold's work is well known among his peers and has brought him a number of honors and awards. In 1980, he received the American Publishers Award for the best book in architecture and urban planning for Trees in Urban Design, now in its second edition. Other accolades include design recognition and honorable mention in the Vietnam Veterans Memorial Competition (1981) and the Pershing Square Competition (1986). Most notably, he is a Fellow of the American Society of Landscape Architects.


A registered landscape architect in a number of states, Arnold is a frequent lecturer; has taught urban design at Pratt Institute in Brooklyn, and has served as consultant to major developers, corporations, and the Ministry of National Development in Singapore

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