We Are Creative Structural Engineers

operating nationally in support of the entire building lifecycle:

Group of structural engineers of O'Donnell & Naccarato
structural engineers of ODonnell & Naccarato


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


Anthony Naccarato, PE, SE, F.ASCE


Mark Lunden, PE, SE

Vice President

Dennis Mordan, PE, SE

Vice President

Paul Panzarino, PE, SE

Vice President

Rod McComas, PE, SE

Vice President

Scott Bauer, PE, SE, LEED AP


James Behler, PE, SE


Michael Herrmann, PE, SE


Alan Miller, PE, SE


Mark Orsini, PE, SE


Brian Rawlings, PE, SE


Melissa Pastras-Brugler, MBA, PHR, SHRM-CP

Chief Financial Officer

Robert Franco, PE, SE

Regional Director

Tom Miltner, PE

Regional Director

Tuna Yelkikanat, PE, LEED GA

Regional Director
Bill and Pete, 1988


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&N’s Philly headquarters office is supported by two Mid-Atlantic branch offices, a Midwest office, and O’Donnell & Naccarato Structural Engineers, a Manhattan-based corporate affiliate founded by O&N Principals to serve projects in New York State.

Philadelphia, PA
701 Market Street,
Suite 6000,
Philadelphia, PA 19106
Mountainside, NJ
200 Central Avenue,
Suite 202,
Mountainside, NJ 07092


New York, NY
40 Worth Street,
Suite 301,
New York, NY 10013
Indianapolis, IN

450 East 96th Street,
Suite 175,
Indianapolis, IN 46240

Copyright © 2022 O'Donnell & Naccarato | Sitemap | Employee Login