Ennead Architects

Ennead Architects is a New York architecture firm known for cultural, academic, scientific, and civic buildings, from museums and planetariums to university research centers. The practice traces its roots to Polshek Partnership and works nationally and internationally on high-profile institutional commissions. In 2026 Ennead joined CannonDesign, a move that pairs its design reputation with a larger firm’s public and institutional reach. Ennead’s portfolio leans toward the kind of complex, publicly visible buildings where architecture carries civic weight, and it remains one of the more recognizable design names in American institutional work.

Ennead Architects has practiced since 1963 and is the successor firm to Polshek Partnership, taking the name Ennead — a group of nine — in 2010. The 200-plus-person studio is based in New York City with offices in Los Angeles and Shanghai and a presence in South Florida. Its work is rooted in humanist principles and concentrated on institutions rather than speculative development.

The client roster tells you where the firm’s expertise lies: cultural and scientific institutions such as the American Museum of Natural History and Carnegie Hall, universities including Stanford and Yale, and civic landmarks like the Clinton Presidential Library. That focus shapes the service mix — museums and performing arts centers, complex laboratory and research buildings, teaching facilities for higher education, and large-scale civic and infrastructure projects.

Ennead’s portfolio spans new construction, renovation and expansion, historic preservation, interior design, and master planning. For institutions weighing an addition against a ground-up building, the firm’s mix of preservation and new-build experience is part of the pitch. It remains one of the more established cultural and academic design practices working out of New York.