Business Details
50+ Years
experience
Emergency
services
Leading Construction & Engineering Solutions
Founded in 1901, Day & Zimmermann has established itself as a leader in delivering advanced talent and technical solutions across complex environments. With over 37,000 employees globally, we specialize in maintenance, construction, engineering, and government services for industries including nuclear power, chemical manufacturing, data centers, and defense. Our commitment to safety, innovation, and client satisfaction drives every project, supported by a century-long track record of executing critical infrastructure initiatives.Our values of integrity, accountability, and continuous improvement guide our operations, ensuring we meet the evolving needs of our clients while maintaining industry-leading safety standards. Through strategic partnerships and a focus on workforce development, we deliver scalable solutions that address both immediate challenges and long-term goals.
Services
Maintenance Services
Construction Projects
Engineering Solutions
Government Services
Workforce Solutions
Details
- Year established: 1901
Highlights and features
- We offer 120+ years of experience in complex construction and engineering projects.
- Our teams maintain a 0.49 Total Recordable Incident Rate for industry-leading safety.
- We implement proprietary Total Accountability Model for project cost and schedule control.
- Our union partnerships ensure access to 16,000+ skilled craft professionals nationwide.
- We hold ISO 9001, 14001, and 45001 certifications for quality and safety management.
Associations and certifications
- ISO 9001
- ISO 14001
- ISO 45001
What people say
Industry-leading safety
Proven project execution
Skilled workforce
Long-term partnerships
Technical expertise
Services
Maintenance Services
Our maintenance solutions optimize asset performance through predictive maintenance, outage management, and 24/7 emergency response capabilities. We serve nuclear, chemical, and industrial clients with specialized teams that reduce downtime while maintaining safety and compliance standards. Our Total Accountability Model ensures consistent quality across safety, cost, and schedule metrics.
Construction Projects
We deliver complex construction projects for power plants, data centers, and government facilities using modular techniques and GPS-enabled equipment. Our experience spans utility-scale solar installations, nuclear reactor upgrades, and mission-critical infrastructure with strict adherence to safety and quality protocols.
Engineering Solutions
Our engineering services include front-end design, piping specifications, and electrical systems planning for industrial and energy clients. We provide site-based teams and office support to ensure technical accuracy while maintaining schedule and budget constraints across diverse project scopes.
Government Services
We offer integrated security solutions, facility construction, and logistics support for U.S. government agencies. Our services include embassy security systems, national training complex development, and technical security implementations meeting federal standards.
Workforce Solutions
Our workforce division connects clients with skilled craft professionals through managed service programs and contingent staffing solutions. We specialize in placing technical personnel for maintenance, construction, and engineering roles across multiple industries.
People
Harold L. Yoh, III
Chairman & CEO
Leading Day & Zimmermann's strategic direction, Harold oversees operations across 150+ global locations. With deep industry experience, he focuses on innovation and sustainable growth while maintaining core values established over 120 years.
Kent Allen
Nuclear Market Leader
Kent directs all nuclear market operations, leveraging decades of industry experience to manage complex projects across North America's nuclear fleet, including advanced reactor technologies and decommissioning initiatives.
Tony Page
Fossil Segment Leader
Tony oversees fossil power plant services, specializing in outage management and plant optimization. He brings extensive experience in coal and gas-fired generation to deliver reliable, cost-effective solutions.
Steve Duda
Industrial Market Leader
Steve leads industrial market expansion, focusing on chemical, data center, and advanced manufacturing projects. His expertise in complex construction drives growth in high-demand sectors.
Matt Black
Director of Business Development
Matt specializes in data center construction solutions, utilizing modular techniques and nationwide resources to deliver mission-critical facilities on time and within budget for major technology clients.
Questions
What industries does Day & Zimmermann serve?
We serve power generation (nuclear, fossil, solar), chemical manufacturing, data centers, defense, and government clients with construction, engineering, and workforce solutions.
How does Day & Zimmermann ensure project safety?
Our safety-first culture maintains a 0.49 TRIR through rigorous training, safety technologies, and field observation programs across 16M+ annual work hours.
What construction methodologies do you use?
We employ modular construction, GPS pile driving, and nationwide fabrication facilities to accelerate project timelines while maintaining quality standards.
How do you address skilled labor shortages?
Through union partnerships, craft training programs, and strategic workforce planning, we mobilize 16,000+ qualified professionals for projects nationwide.
What quality certifications do you hold?
We maintain ISO 9001 (quality), ISO 14001 (environmental), and ISO 45001 (safety) certifications across our operations.