Ennead Architects

Overview

Ennead Architects is an architecture firm that designs civic, commercial, cultural, educational, and healthcare buildings and campuses [2]. The firm was founded in 1963 by James Polshek, who left in 2005, and the partners renamed the practice Ennead in mid-2010 [4]. Based in New York at 1 World Trade Center, 40th Floor [5], Ennead describes itself as a 200+ person studio with offices in Shanghai and Los Angeles, where eight partners share responsibility for the firm's vision and operation [6]. The firm's services span new building design, renovation and expansion, historic preservation, interior design, programming, and master planning [3]. Notable projects include the Delacorte Theatre in Central Park, Briger Hall at Princeton University, the Phil and Penny Knight Campus at the University of Oregon, and the Johns Hopkins University Bloomberg Center [9]. In May 2026, Ennead joined CannonDesign [7].

The company's own site places it in New York: Company lists New York headquarters at '1 World Trade Center, 40th Floor, New York, NY 10007' with phone number, presented as primary office. [1]

Ennead Architects was founded in 1963 by James Polshek, who left the firm in 2005, and the partners renamed the practice Ennead in mid-2010. [4]

Ennead's New York office is at 1 World Trade Center, 40th Floor, New York, NY 10007. [5]

Business address: 1 World Trade Center, New York, New York, 10007. [10]

Growth & traction

Ennead describes itself as a 200+ person studio based in New York City with offices in Shanghai and Los Angeles, where eight partners share responsibility for the vision and operation of the studio. [6]

Ennead's site carries the headline "TIME Names Ennead One of the 10 Most Influential Design and Build Companies of 2026". [8]

Customers

Projects featured on Ennead's homepage include the Delacorte Theatre in Central Park, home to The Public Theater's "Shakespeare in the Park"; Briger Hall, Commons and Sarofim Pavilion at Princeton University; the Phil and Penny Knight Campus for Accelerating Scientific Impact at the University of Oregon; the Edelman Fossil Park & Museum of Rowan University; and the Johns Hopkins University Bloomberg Center. [9]