Day & Zimmermann Ranked #1 O&M Contractor in Power for Fifth Consecutive Year by ENR

PHILADELPHIA, PA - September 19, 2012 – Day & Zimmermann, the century-old family-owned provider of construction & engineering, staffing and defense solutions for leading corporations and governments around the world, has been named by Engineering News-Record (ENR) as the number one Operations and Maintenance Contractor in Power for the fifth straight year.

The ranking comes as part of ENR’s 2012 Top 400 Contractors Sourcebook, which provides market analysis and rankings of the largest U.S.-based architectural and engineering firms in major industry sectors. 

“Achieving this kind of recognition for five years in a row is a reflection of the trust our valued customers place in the knowledge of our people and our ability to get the job done,” said Michael McMahon, president of Day & Zimmermann’s Engineering, Construction and Maintenance (ECM) group.  “But we are never satisfied. Through our relentless commitment to the betterment of our customers, we will continue to raise the standards of safety, quality and reliability in every project, every day.”

In addition to its number one O&M contractor ranking, Day & Zimmermann also ranked as follows:

  • #34 overall on ENR’s list of the Top 400 Contractors
  • #4 on the Top Contractors in Power list
  • #15 on the Top Contractors in Chemical Plants list

Day & Zimmermann’s ECM unit is one of the nation’s leading providers of total plant lifecycle solutions for the power, process and industrial markets. With deep industry experience, innovative technology tools, a rigorous safety culture, and expert project teams, Day & Zimmermann ECM delivers integrated solutions in engineering, construction, maintenance and specialty services for our customers’ toughest challenges.

Day & Zimmermann’s 24,000 employees provide industrial, defense and workforce solutions to a broad base of commercial and government customers. Operating from more than 150 worldwide locations with 2.7 Billion USD in revenues, the Day & Zimmermann family of companies is currently ranked as one of the largest private companies in America by Forbes and is a former winner of the U.S. National Family Business of the Year award. Founded in 1901 and headquartered in Philadelphia, PA, Day & Zimmermann companies today provide engineering, construction and maintenance services, and staffing services to the commercial and government sector, and munitions products, security, logistics, equipment maintenance and facilities management services to the Department of Defense, other government groups and defense industry contractors. For more information, visit