We Are Creative Structural Engineers
operating nationally in support of the entire building lifecycle:
![Group of structural engineers of O'Donnell & Naccarato](/wp-content/themes/yootheme/cache/6a/Backpack-group_for-Profile-page2-6a5870f8.jpeg)
![structural engineers of ODonnell & Naccarato](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F07%2FIMG_5344-scaled.jpg%22%2C%22thumbnail%22%3A%22%2C500%2C%22%7D&hash=ea67a4c5)
![](/wp-content/themes/yootheme/cache/6d/AIA-Indy-for-Profile-Page-6dd3849a.jpeg)
Est. 1981
O’Donnell & Naccarato leverages over 40 years of structural engineering experience to design new buildings, renovations, retrofits, expansions, and restorations of all types and levels of complexity. As a partner to design professionals and building owners alike, our services are designed to enhance each facility’s value and extend useful life. From new healthcare facilities to industrial buildings, historic restorations, and fit-outs — our engineering experience is diverse in scope and spans every major vertical construction sector. → View Projects
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2019%2F03%2FNS-Revit-1200.jpg%22%2C%22thumbnail%22%3A%22%2C%2C%22%7D&hash=c203c5fd)
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2019%2F03%2FW-Element-1200.jpg%22%2C%22thumbnail%22%3A%22%2C%2C%22%7D&hash=86a3d451)
Services
New Buildings
- Structural Design
- Condition Assessment
- Parking / Functional Design
- Seismic Evaluation
- Feasibility Study
- Peer Review
Existing Buildings
- Adaptive Reuse
- Additions
- Vertical Expansion
- Interior Renovation
- Facility Assessment
- Emergency Response
Facades & Garages
- Philadelphia Facade Inspection Ordinance-Compliant Assessments
- NYC DOB-Compliant Assessments
- Condition Assessment
- Repair / Restoration Design
- Historic Preservation
Leadership
Officers
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FAFN_300x300.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=74a85085)
Anthony Naccarato, PE, SE, F.ASCE
Chairman & CEO
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FDVM_300x300_2.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=e5222bb4)
Dennis Mordan, PE, SE
President
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FSMB-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=4e152378)
Scott Bauer, PE, SE, LEED AP
Vice President, Chief Engineering Officer
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FMEH-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=2fac5404)
Michael Herrmann, PE, SE
Vice President, Chief Marketing Officer / Chief Administration Officer
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FMPB-300x300_2.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=2440c378)
Melissa Pastras-Brugler, MBA, PHR, SHRM-CP
Chief Financial Officer, Chief Human Resources Officer
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FPPP-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=897c65a6)
Paul Panzarino, PE, SE
Vice President
Principals
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FJWB-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=6af481e2)
James Behler, PE, SE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FARM_300x300.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=e900321c)
Alan Miller, PE, SE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FMJM-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=bde17bc9)
Michael Miller, PE, SE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FTMM-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=74f3ad02)
Tom Miltner, PE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F06%2FMAO-scaled.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=eec562b2)
Mark Orsini, PE, SE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FBFR_300x300.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=332c6051)
Brian Rawlings, PE, SE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2024%2F07%2FKyle-Terry-PE-o-n.png%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=362f1d93)
Kyle Terry, PE
Principal
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FDW_300x300_2.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=4b993c78)
Douglas Wood, PE
Principal
Directors
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FRJF-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=98f3b9fc)
Robert Franco, PE, SE
Regional Director
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FDEF-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=ed5e09fc)
Daryl Fennell
Senior Associate, Director of Production
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FTY_300x300.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=fa72901a)
Tuna Yelkikanat, PE, LEED GA
Director of Strategic Partnerships
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F01%2FHT-300x300-1.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=6bed7a34)
Holly Taubman
Marketing Director
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2023%2F06%2FHeadshot.jpg%22%2C%22thumbnail%22%3A%22300%2C%2C%22%7D&hash=185f25de)
Brian Starrett, PE
Senior Associate / Regional Director
![](https://www.o-n.com/wp-admin/admin-ajax.php?action=kernel&p=image&src=%7B%22file%22%3A%22wp-content%2Fuploads%2F2019%2F03%2FFounders-Photo-1200.jpg%22%2C%22thumbnail%22%3A%22%2C%2C%22%7D&hash=5f5e5f32)
Foundation
O&N’s predecessor Seymour Greenberg opened in Philadelphia in 1954 later welcoming Principals William O’Donnell and Peter Naccarato. In 1981 the firm adopted its current name and set a foundation for national growth. Today O’Donnell & Naccarato has two offices in the Mid-Atlantic region, two offices in Florida, a Midwest office, and O’Donnell & Naccarato Structural Engineers, our Manhattan based corporate affiliate.
Our Mission
O’Donnell & Naccarato is dedicated to using a progressive design and team oriented approach to provide structural engineering services that contribute to the success of our clients, employees and community.
Our Vision
We seek to realize our mission by providing a supportive, engaging and team-oriented atmosphere for our employees and clients which is rooted in pro-active internal and external communication. We expect to realize a fair return for our efforts and, as an ESOP (Employee Stock Ownership Plan) firm, provide the opportunity for all employees to share in the prosperity of the firm. O’Donnell & Naccarato’s vision is to extend our vast experience and positive reputation in structural engineering to be an industry leader through outstanding:
- Project Creativity
- Efficiency
- Technical Prowess
- Delivery
- Client Relationships
Our Values
- Excellence in Structural Engineering
- Quality Service
- Proactive Communication
- Teamwork
- Unwavering Integrity
- Progressive Approach
- Being and Developing Leaders
- Retaining and Recruiting High-Quality Personnel