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Who We Are
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Harold L. Yoh, III
Kathleen King
Lisa Ann Cooney
Sankara Viswanathan
Daniel Ross
Mike Yoh
BG (Ret) John J. McGuiness
Doug Magee
John McCormick
Emmett McGrath
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Record Diesel Generator Rebuild Project
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D&Z Excels on Large Boiler Project
One Year Later: Partnership Continues to Grow Stronger
L-83 Boilermakers shine on Jeffrey Energy Center outages
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Design of Top U.S. Law Enforcement and National Security Training Complex
Firing Range Program (CONUS & OCONUS)
Integrated Security for One of the Largest U.S. Embassies in the World
Ordnance Operations, Management & Operations (M&O) and Security for Largest Global R3 Demilitarization Complex
Cleared IT Support for Critical Infrastructure Communications to Unites States Navy & Marine Corps
Secured Renewed U.S. Diplomatic Presence in High Threat Region of Africa
Recruiting & Workforce Solutions
Yoh.com
Get Hired
Get Talent
DZConneX.com
Careers
Why Work at D&Z
How We Hire
Our People
Director of Operations
Director, Talent Sourcing & Recruiting
Senior Manager, Client Services
Senior Mechanical Engineer
Director, Compliance & Training / Ethics Officer
Senior Director of Client Services
Contracts Administrator
Deputy Program Manager
QC, Training Coordinator
Production Operator
Head Chef
Test Range, Supervisor
Recruitment Process Outsourcing
Senior Plans Analyst, Plans & Operations
Quality Engineer Intern – Medium Caliber and Direct Fire Business Units
Diversity & Inclusion
Veteran's Resources
Our Values
Success Stories
Join Us
Professional Opportunities
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News: Day & Zimmermann NewsArchitecture & Construction
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3.27.2023
Why You Should Advocate for and Celebrate Skilled Craft Careers
We have a problem. The construction industry is going to need nearly 600,000 new workers in 2023 — that’s on top of normal demand and maintenance ...
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12.13.2022
Celebrating 75 Years With the Department of Energy
Day & Zimmermann, including Mason & Hanger and SOC together have proudly served the Department of Energy (DOE) and DOE Mission for 75 years.
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9.1.2022
Day & Zimmermann Recognized as One of ENR’s Top 225 International Design Firms
Day & Zimmermann is proud to be recognized as one of 2022’s Top 225 International Design Firms according to Engineering News-Record (ENR). ENR’s ...
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7.11.2022
Day & Zimmermann Maintenance and Construction Extends 42-Year-Old Partnership with Dominion Energy
PHILADELPHIA, PA—July 11, 2022– Day & Zimmermann (D&Z), the century-old, family-owned provider of construction, engineering, maintenance, ...
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6.6.2022
Day & Zimmermann Named Prime Supplier of the Year by Tennessee Valley Authority
Day & Zimmermann (D&Z), the 120-year-old, family-owned provider of construction & engineering, staffing, and defense solutions for ...
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5.10.2022
Day & Zimmermann's 2022 ESG Report Shares Our Commitment to Sustainability
As a company who has been around for more than 120 years, we’ve seen many changes - none more important than a focus on helping our planet. While we ...
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12.14.2021
Day & Zimmermann Design Listed as Significant Historic Place in Philadelphia
PHILADELPHIA, PA – December 14, 2021 – Fox Motor Car Company, a property constructed by Day & Zimmermann in 1921, has been listed as a ...
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8.6.2021
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 ...
Read More
12.1.2020
Mason & Hanger Wins ACEC National Award for U.S. Embassy in Kosovo
Mason & Hanger is honored and humbled to be recognized by ACEC as a Grand Award Winner for the New U.S Embassy in Pristina, Kosovo. A symbol of ...
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5.13.2020
Benjamin Lilly Announced as President of Day & Zimmermann’s Process & Industrial Group
Benjamin (Ben) Lilly has been appointed the role of President of Day & Zimmermann's Process & Industrial (P&I) Group. Mr. Lilly will ...
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