We are the original Betterment Company®—a family-owned diversified business founded more than a century ago by Charles Day, whose betterment reports helped modernize American factories.
Today, we are still in the business of betterment—maintaining the nation’s power infrastructure, protecting American freedoms and accelerating innovation around the world. We are advancing and enhancing the fundamentals of modern productivity— talent, efficiency, and safety.
Founded in 1901, Day & Zimmermann is a family-owned company with a workforce of 43,000 specializing in construction & engineering, operations & maintenance, staffing, security and defense solutions for leading corporations and governments around the world. Operating from more than 150 worldwide locations, Day & Zimmermann is headquartered in Philadelphia, PA.
Day & Zimmermann’s vision is to accelerate the next generation of innovation. Every day we are advancing and enhancing the fundamentals of modern productivity— talent, efficiency, and safety. Like the city of Philadelphia, we are evolving and have been going through a tremendous amount of change. We foster better solutions for keeping our nation’s power plants running safely and reliably, hiring and placing skilled health care professionals that keep our country healthy, and protecting U.S. national security interests with mission-critical solutions.
Innovation is in our DNA. The origins of Day & Zimmermann date back to 1901 and a mere seven years after our founding, the company was working on one of the most significant human engineering achievements of the twentieth century—the construction building of the Gatun Lock system of the Panama Canal. By the 1960s, Day & Zimmermann was assisting with the design of the Mercury and Gemini capsules that would put the first American astronauts in space. These history-altering projects had ties right here in Philadelphia.
While our past achievements built our strong foundation, we’ve not only sustained over time but have thrived and have new and exciting developments on the horizon. Today we are entering a new era of transforming the way our customers and staff, build, streamline and secure their future.
Yoh, our staffing division is helping to place workers in cutting-edge fields like software development, life sciences, healthcare and IT. Our engineering, construction, and maintenance division is using new technologies, processes and systems to create efficiencies for power and industrial plants. We even recently acquired a new cybersecurity capability. Like in the earlier days working on the Panama Canal, we’re looking at a series of history-changing projects that in summation will push us and our country forward.
Day & Zimmermann is currently ranked as one of the largest private companies in the U.S. by Forbes.
- #1 Ranked Operations & Maintenance Contractor for 10 consecutive years (ENR)
- Yoh – our recruiting and workforce solutions company—was named to HRO Today’s RPO Baker’s Dozen list
- Ranked in the Top 100 Defense Companies