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Ennead Architects

Also known as: James Stewart Polshek and Associates, Polshek Partnership Architects

Active

Credited as architect on multiple recently completed cultural/institutional projects: The Pulse at ASU's Beus Center for Law and Society (2016), Signage at PEM alongside the firm's Peabody Essex Museum expansion wing (opened 2019), the Jean & Ric Edelman Fossil Park & Museum of Rowan University (opened 2025), and the David H. Koch Center for Cancer Care at Memorial Sloan Kettering (opened 2020). Merged with CannonDesign in April 2026 but continues practicing as a distinct studio ("Ennead, a CannonDesign company") per the firms' joint announcement. (verified 2026-07-18)

Ennead Architects is a New York City-based architecture firm founded in 1963 (as James Stewart Polshek and Associates, renamed Ennead in 2010), known for museum, library, and cultural-institution architecture; became a CannonDesign company in April 2026 while continuing to practice under the Ennead name.

HeadquartersNew York, NY
Other officesLos Angeles, CA
Founded1963
RolesArchitecture
Websitehttps://www.ennead.com

Projects (33)

ProjectVenueRoleYear
Future Museum (Nature & Culture Museum of Wisconsin) Milwaukee Public Museum Architecture 2027 (announced)
Tenaska Center for Arts Engagement Steelhouse Omaha Architecture 2026
Delacorte Theater Revitalization Delacorte Theater Architecture 2025
Jean & Ric Edelman Fossil Park & Museum of Rowan University Jean & Ric Edelman Fossil Park & Museum of Rowan University Architecture 2025
Honickman Center Honickman Center Architecture 2024
Hopkins Bloomberg Center Donor Recognition & Wayfinding Hopkins Bloomberg Center Architecture 2023
Steelhouse Omaha Steelhouse Omaha Architecture 2023
Sylvia H. Rambo Exhibit Sylvia H. Rambo United States Courthouse Architecture 2023
David H. Koch Center for Cancer Care (Building) David H. Koch Center for Cancer Care Architecture 2020
Signage at PEM Peabody Essex Museum Architecture 2019
University of Michigan Museum of Natural History — New Home in the Biological Sciences Building University of Michigan Museum of Natural History Architecture 2019
Hassenfeld Children's Hospital Helen L. and Martin S. Kimmel Pavilion Architecture 2018
Kimmel Pavilion Helen L. and Martin S. Kimmel Pavilion Architecture 2018
Renovation Robinson Center Architecture 2017
The Pulse Beus Center for Law and Society Architecture 2016
MassArt Design and Media Center MassArt Design and Media Center Architecture 2016
Robinson Center Renovation Robinson Center Architecture 2016
Jazz at Lincoln Center, Frederick P. Rose Hall Public Space Redesign Lincoln Center for the Performing Arts Architecture 2015
Renovation and Restoration Museum of the City of New York Architecture 2015
Staten Island Courthouse Staten Island Courthouse Architecture 2015
Anderson Collection at Stanford University Anderson Collection at Stanford University Architecture 2014
Tisch Hospital Renovations and Addition Tisch Hospital Architecture 2014
Discovery Wall Belfer Research Building Architecture 2014
Renovation and Expansion Yale University Art Gallery Architecture 2012
Rio Tinto Center Natural History Museum of Utah (Rio Tinto Center) Architecture 2011
National Museum of American Jewish History Core Exhibition Weitzman National Museum of American Jewish History Architecture 2010
Visitor Center and Nature Walk Newtown Creek Wastewater Treatment Plant Architecture 2010
Newseum Newseum Architecture 2008
Elizabeth A. Sackler Center for Feminist Art Elizabeth A. Sackler Center for Feminist Art Architecture 2007
William J. Clinton Presidential Center William J. Clinton Presidential Center Architecture 2004
Main Building National Museum of the American Indian Architecture 2004
Judy and Arthur Zankel Hall Judy and Arthur Zankel Hall Architecture 2003
Rose Center for Earth and Space American Museum of Natural History Architecture 2000

Sources