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

More about us

  • 2015_Blog_(Best_Firms_To_Work_For)_TH
    O&N Ranks Among Top 20 in "Best Firms To Work For" 2015
  • 2015_Blog_(Mark_Orsini,PE_SE_SEAMASS)_TH
    Mark Orsini Presents at SEAMASS Analysis & Design Seminar
  • 2015_Blog_(Year_In_Review)_TH
    O'Donnell & Naccarato's Year In Review 2015
  • Photos from the Top of the Skyline
    Photos from the Top of Philly's Tallest Buildings
  • Our Philadelphia Office is Moving to 701 Market Street
    Our Philadelphia Office Has Moved to 701 Market Street
  • 2015_Blog_(Caleb_Shank,_PE)_TH
    Congrats to Caleb Shank, O&N’s Newest Professional Engineer
  • 2014_Blog_(AFN-Receives-ACE-Honor)_TH
    O&N President Receives Surprise Award From ACE Mentor Program
  • 2015_Blog_(Facade_Department_Position)_TH
    A day in the life of a Facade Investigator
  • 2015_Blog_(Preservation_Alliance_Awards)_TH
    2 O&N Projects Awarded Preservation Alliance’s Top Honor
  • Selim Lunden
    Remembering Selim Lunden
  • Building Owners Guide
    Building Owner's Guide to Facade Inspection Ordinance
  • New Hires
    Meet Our Newest Hires, Mathu Davis & Brian Hindes
  • 2015_News_(AFN_Offers_Business_Development_Insights_at_SMPS)_TH
    O&N Pres. Talks Biz Development With SMPS Philly
  • 2015_Blog_(Michael_Herrmann_Promotion)_TH_V2
    Michael Herrmann Promoted to Principal
  • 2015_Blog_(Scott_Bauer_Promotion)_TH
    Scott Bauer Promoted to Principal
  • 2014_Blog_(O&N_Facade_Team_to_Present_At_Design_on_the_Delaware)_TH
    O&N Facade Team to Present At Design on the Delaware
  • AIA Philadelphia Honors Navy Yard's First Hotel
    AIA Philadelphia Honors Navy Yard's First Hotel
  • CCTEC Construction Commences
    CCTEC Construction Commences
  • 2014_Blog_(DesignPhiladelphia_2014_Events)_TH
    Looking Forward To DesignPhiladelphia 2014
  • Ryan T. Rotzell, PE
    Ryan Rotzell Receives Lehigh Valley Business Journal’s Forty Under 40 Award
  • O&N Named Healthiest Employer
    O&N Named “Healthiest Employer” For 3rd Straight Year
  • One Liberty Place Facade Investigation
    O&N Inspects Philly's Landmark One Liberty Place Skyscraper
  • 2014_News_(Nor'easter_Response)_TH
    O&N Assesses Buildings Damaged By Massive Nor'easter
  • O&N Facade Team Members Achieve SPRAT Certification
    O&N Facade Team Members Achieve SPRAT Certification
  • O’Donnell & Naccarato’s Bethlehem, PA Staff Move Into New Office
    O&N Bethlehem, PA Staff Move Into New Office
  • Anthony Naccarato, President
    O&N Announces Leadership Transition
  • 2013_News_(Congrats_To_PhilaU_From_O&N)_TH_2
    Congrats To Philadelphia University From O&N
  • HomePage_Thumb_NJ_Office_2
    O&N Opens Northern NJ Office To Serve New York Metro Area
  • Healthiest Employer
    O&N Named “Healthiest Employer” For 2nd Straight Year
  • Two DVASE Awards for O&N
    Two DVASE Awards For O&N
  • Hotel Monaco Receives Grand Jury Award
    Hotel Monaco Receives Grand Jury Award
  • 2013_News_(Andrew_Emmets_SPRAT_Certification)_Feature
    O'Donnell & Naccarato Designer Receives SPRAT Certification
  • 2013_News_(Southstar_Lofts_Breaks_Ground)
    Southstar Lofts Breaks Ground
  • 2013_News_(Hotel_Monaco_LEED_Certified)
    Hotel Monaco Awarded LEED Gold Certification
  • Ryan Rotzell
    Ryan Rotzell Promoted to Project Executive
  • 2012_News_6
    O'Donnell & Naccarato Wins NCSEA's Outstanding Project Award
  • 2012_News_7
    The First Hotel at the Navy Yard
  • 2012_News_5
    Pinnacle Health Breaks Ground
  • News
    Anthony Naccarato speaks at AIA
  • News
    Whitehall Receives BALA
  • 2012_News_1_(TH)_V2
    O'Donnell & Naccarato Qualifies as Small Business for Federal Contracts
  • 2010_news_4_banner
    O'Donnell & Naccarato surpasses BIM milestone
  • News
    Penn Medicine breaks ground