A New York-based architecture and design firm led by Joshua Prince-Ramus. In 2000, Prince-Ramus purchased the New York office of OMA (Office for Metropolitan Architecture) and renamed the firm Ramus Ella Architects (REX).
Source:
"People and Places This Week."
Architecture Week, May 17, 2006. Accessed June 27, 2013.
http://www.architectureweek.com/2006/0517/people_and_places.html