LeMessurier Consultants

LeMessurier Consultants
Name	LeMessurier Consultants
Founded	1961
Founder	William LeMessurier
Headquarters	Boston, Massachusetts
Industry	Structural engineering
Key people	William LeMessurier; successors

LeMessurier Consultants is an American structural engineering firm founded in 1961 by William LeMessurier. The firm gained international prominence for innovative skyscraper design, forensic engineering, and influential contributions to building codes and professional ethics. Its work spans collaborations with leading architects, developers, and institutions across North America, Europe, and Asia.

History

The firm was established in Boston, Massachusetts, by William LeMessurier following his academic work at Harvard University and early career at SOM (Skidmore, Owings & Merrill), where he collaborated on projects linked to United Nations Headquarters, Lever House, and other modernist commissions. Throughout the 1960s and 1970s the firm worked with architectural practices such as I. M. Pei & Partners, Kohn Pedersen Fox, HOK, and SOM (Skidmore, Owings & Merrill) on projects in cities including New York City, Boston, Chicago, and Los Angeles. In the 1980s and 1990s the practice engaged with clients like Tishman Realty, Boston Properties, and TrizecHahn while responding to regulatory changes influenced by incidents involving structures such as the John Hancock Tower (Boston) and the Kansas City Hyatt Regency walkway collapse. The firm continued into the 21st century addressing challenges posed by events associated with September 11 attacks, evolving standards from American Institute of Steel Construction, and international collaborations with firms in Tokyo, London, Dubai, and Shanghai.

Notable Projects

LeMessurier Consultants provided structural engineering for high-profile commissions including the Citicorp Center (New York City), the Hancock Tower (Boston), and the Prudential Tower (Boston). Other projects involved collaboration on John Hancock Center (Chicago)-era concepts, large mixed-use developments for Boston Properties, and stadium structures akin to work undertaken for venues connected with Fenway Park renovations and redevelopment efforts in Cambridge, Massachusetts. The firm consulted on university projects at Massachusetts Institute of Technology, Harvard University, and Tufts University and contributed to healthcare facilities affiliated with Massachusetts General Hospital and Brigham and Women's Hospital. Internationally, LeMessurier Consultants advised on office towers and residential high-rises in financial districts such as Canary Wharf and La Défense.

Engineering Philosophy and Innovations

The firm emphasized structural efficiency, redundancy, and innovation in steel and concrete systems, drawing on techniques associated with engineers and theorists linked to Eero Saarinen, Fazlur Rahman Khan, Pier Luigi Nervi, and Ove Arup. Its approach integrated wind engineering studies that involved collaboration with facilities like the Boundary Layer Wind Tunnel Laboratory and computational methods later commonized by software from firms influenced by ANSYS and Autodesk. LeMessurier Consultants advanced concepts in tuned mass dampers used in projects similar to those by Edmund J. Tobin and in seismic detailing consonant with standards promulgated by American Society of Civil Engineers and design guides related to International Building Code jurisdictions. The firm’s practice reflected professional standards championed by American Society of Civil Engineers, National Academy of Engineering, and peer-reviewed discourse in venues like Journal of Structural Engineering.

Citicorp Center Crisis and Ethical Response

The firm is widely associated with the structural vulnerability discovered in the Citicorp Center (New York City), a case studied alongside ethical analyses involving figures such as William LeMessurier and debated in publications by LeCorbusier-era commentators and historians of engineering. The crisis involved wind-load reassessment, emergency retrofitting, and coordination with municipal authorities including New York City Department of Buildings and insurance stakeholders like Marsh & McLennan. The episode prompted professional dialogue within National Society of Professional Engineers and American Institute of Architects forums about disclosure, risk mitigation, and responsibility, influencing later revisions in codes overseen by American Institute of Steel Construction and regulatory practice in New York City and beyond.

Organizational Structure and Leadership

Originally led by William LeMessurier, the firm transitioned to a multi-disciplinary leadership model with principals and partners drawn from academic and practice spheres affiliated with Massachusetts Institute of Technology, Harvard Graduate School of Design, and professional organizations such as Structural Engineers Association of Massachusetts and American Society of Civil Engineers. Governance combined project teams, specialty groups in wind and seismic engineering, and sustainability advisors interacting with entities like U.S. Green Building Council and certification programs influenced by LEED. The office maintained collaborations with construction managers including Turner Construction Company and Gilbane Building Company and with architecture firms noted earlier.

Awards and Recognition

Projects and principals associated with the firm received honors from institutions such as the American Institute of Architects, National Academy of Engineering, American Society of Civil Engineers, and regional awards from Boston Society of Architects. William LeMessurier personally received accolades reflecting contributions to structural engineering and professional ethics, joining contemporaries recognized by awards analogous to the AIA Gold Medal, Roebling Medal, and lifetime achievement acknowledgments from SEI-affiliated programs and university alumni associations including Harvard University and Massachusetts Institute of Technology.

Category:Structural engineering firms