Day & Zimmermann recognized as one of ENR’s Top 225 International Design Firms

Day & Zimmermann is proud to be recognized as one of 2021’s Top 225 International Design Firms according to Engineering News-Record (ENR). ENR’s Top 225 International Design Firms list, published annually each July, ranks the 225 largest world designs firms, both publicly and privately held, based on design-specific export revenue generated from projects outside each firm's respective home country. 

This year’s report, titled Designing for Shifting Priorities, addresses the weaknesses laid bare by COVID-19, and how infrastructure projects are poised to drive world economics back to pre-pandemic levels with one simple mantra—build back better. Emerging from pandemic lockdowns, global design firms are restructuring operations while projects are being reconfigured to fit a continental shift in client priorities.

“Mason & Hanger is pleased to maintain our position among ENR's Top International Design firms,” said Ben Lilly, President of Mason & Hanger, a Day & Zimmermann company that provides architecture and engineering design services. “This recognition is meaningful to our teams working around the clock to design government facilities worldwide, both domestically and abroad, as we uphold our commitment to deliver upon our mission of Building a More Secure World®.”

To read ENR’s full Build Back Better report and to view the full Top 225 Design Firms list, visit


Founded in 1901, Day & Zimmermann is a family-owned company with a workforce of over 41,000 specializing in construction & engineering, staffing and defense solutions for leading corporations and governments around the world. Operating from more than 150 worldwide locations with 2.4 Billion USD in revenue, Day & Zimmermann is currently ranked as one of the largest private companies in the U.S. by Forbes. Headquartered in Philadelphia, PA, our first work was to develop "Betterment Reports" that helped modernize American factories. Today, we are still in the business of betterment—maintaining the nation's power infrastructure, protecting American freedoms and driving technological advancements around the world. We do what we say®


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