Ennead Architects LLP (/ˈenēˌad/) is a New York City-based architectural firm. The firm was founded in 1963 by James Polshek, who left the firm in 2005 when it was known as Polshek Partnership. The firm's partners renamed their practice in mid-2010. The 240-person firm offers architecture, master planning, historic preservation and interior design services. The firm’s work is for cultural, educational, commercial, governmental, laboratory, healthcare, and scientific not-for-profit institutions.