Creative Structural Engineers striving to provide the most in-depth analysis to support each building’s unique architectural expression and purpose.

More about us

  • O&N Welcomes Manhattan Office Director Robert Franco, PE
  • O&N Ranked 5th Best Firm To Work For In North America
  • Peggy Hart
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  • Alan R. Miller
    Celebrating Recent Promotions and Hires
  • Three O’Donnell & Naccarato Project Executives Promoted to Principal
    Three Execs. Promoted to Principal
  • W / Element Hotel Philadelphia
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  • “Jason
    O&N Director of Restoration Profiled by The Philly Voice
  • W and Element Hotel Philadelphia Foundation Pour Time-lapse Video
    W / Element Philadelphia Hotel Foundation Pour Time-lapse Video
  • Jason Coleman, PE, CDT Is O&N’s New Director of Restoration