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Mancini•Duffy is a New York-based architecture and interior design firm. Mancini•Duffy was formed by the 1986 merger of Ralph Mancini Associates, Inc. (established in 1981) and Duffy Inc. (established in 1955); in 2011, it acquired certain assets of the interior design firm TSC Design (established in 1995). The firm provides a full range of interior planning, design, and architecture services as well as specialized services such as CAFM, strategic planning, and workplace strategy; graphics and signage; identity and brand development; and product design.

Mancini•Duffy is the operating name of Halsey, McCormack & Helmer, Inc. Originally established in 1915 as Thomas Bruce Boyd Architect, Inc., the corporation reorganized in 1920 and changed its name to Halsey, McCormack & Helmer, Inc. The firm was noted for its prestigious banking projects, including the Williamsburgh Savings Bank in Brooklyn, New York; it was purchased by Duffy Inc. in 1967.

Recent high-profile projects include headquarters relocations for JPMorgan Chase, the CIT Group, Condé Nast Publications, and AOL; a headquarters build-out for Time Warner at Time Warner Center; new television studios and production facilities for NBC Sports Group in Stamford, CT; and an ongoing renovation of Bloomingdale's flagship store in Manhattan. The firm placed at #54 in Interior Design's 2012 "Giants" survey.

A former tenant of Two World Trade Center, Mancini•Duffy's New York offices were destroyed in the September 11, 2001 attacks. Its New York office is currently located in Midtown Manhattan.