O’Donnell & Naccarato Acquires Goldstein-Milano Structural Engineers

Philadelphia, Pennsylvania – O’Donnell & Naccarato (O&N), a nationally recognized structural engineering firm, has acquired Goldstein-Milano Structural Engineers (GMSE), a Reading, Massachusetts-based structural engineering practice. The acquisition establishes O&N’s presence in New England and expands the combined firm’s capabilities across healthcare, laboratory, office, multifamily residential, parking, renovation, and specialty-building projects. GMSE also brings significant experience in the structural engineering of Proton Therapy centers and cancer treatment facilities, complementing O&N’s healthcare portfolio and strengthening the firm’s ability to support the planning and design of advanced healthcare environments nationwide.

Founded in 2005 by Brent Goldstein, PE, and Christopher Milano, PE, GMSE has built lasting relationships with architects, developers and institutions throughout Greater Boston. GMSE will continue serving clients from its Reading office with the same team clients know and trust. Backed by O&N’s national resources and network of offices, the firm is well-positioned to support its growing portfolio of work in New England.

GMSE’s recent work in the region includes Andover Yards, a 164-unit residential development with structured parking in Andover, Massachusetts; CFS 3, an office, laboratory and manufacturing development in Devens, Massachusetts; and 17 Story Street, an eight-story residential building in Cambridge that includes structural support for the relocation of a historic house.

GMSE is widely recognized as a leading structural engineer for Proton Therapy facilities, having engineered more than 40 proton and particle treatment centers nationwide and performed validation studies for domestic and international projects. Notable projects include the Roberts Proton Therapy Center at Penn Presbyterian Medical Center in Philadelphia, the Mayo Clinic Andersen Building Expansion in Rochester, Minnesota, and the Miami Cancer Institute in Miami, Florida. Now part of O&N, GMSE brings this specialized experience to health systems planning new or expanded cancer treatment facilities nationwide.

“GMSE brings two strengths we value greatly: a respected team with deep roots in Greater Boston and the industry’s leading expertise in Proton Therapy,” said Anthony Naccarato, PE, SE, F.ASCE, CEO of O&N. “We are committed to growing GMSE’s work throughout Greater Boston, and we look forward to bringing the recognized leader in structural design of Proton Therapy projects to our clients nationwide.”

“We’ve spent more than 20 years building GMSE and developing lasting relationships with clients in New England and across the country,” said Brent Goldstein, PE, co-founder of GMSE. “For our clients, the people they work with won’t change. What changes is the depth of resources behind us. Joining O&N allows us to expand our capacity, pursue larger projects, and serve more clients while continuing to deliver the quality and service they expect.”

The acquisition is effective as of October 29, 2026. With the addition of GMSE’s seven-person team, including co-founders Brent Goldstein, PE, and Christopher Milano, PE, O&N now operates from 11 offices nationwide. Goldstein and Milano will serve as principals at O&N, and GMSE will operate as GMSE/O’Donnell & Naccarato.

About O’Donnell & Naccarato

O’Donnell & Naccarato is an employee-owned structural engineering firm operating nationally from offices in Florida, Indiana, Massachusetts, New Jersey, New York, North Carolina, Ohio, and Pennsylvania. With strong experience in every major vertical construction sector, O’Donnell & Naccarato supports the entire lifecycle of a building, starting with the initial structural design to renovations and ultimately to restoration.

As a partner to design professionals, owners and institutions, our objective is to incorporate each stakeholder’s demands of form, function, schedule and budget into each engagement. O’Donnell & Naccarato is a proud Employee Stock Ownership Plan company, providing all employees the opportunity to share in the success of the firm.

For more information, visit www.o-n.com.

About Goldstein-Milano Structural Engineers

Founded in 2005, Goldstein-Milano Structural Engineers (GMSE) is a Reading, Massachusetts-based structural engineering firm serving clients throughout Greater Boston and beyond. The firm’s portfolio includes healthcare, laboratory, office, multifamily residential, parking, renovation, and specialty-building projects, with notable experience in Proton Therapy centers and cancer treatment facilities. GMSE provides practical, cost-effective structural engineering solutions through a collaborative, client-focused approach and direct senior-level involvement on every project.