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Day and Zimmermann

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Template:Infobox Company

Day & Zimmermann is a privately held, family-owned industrial conglomerate headquartered in Philadelphia. Founded in 1901 by Charles Day and John Zimmermann, the company has grown into one of America's largest private companies with over 51,000 employees and revenues exceeding $3 billion. Day & Zimmermann operates in three main sectors: defense and munitions, engineering and construction, and staffing services. The Yoh family has owned and operated the company since 1961, maintaining Philadelphia headquarters and representing one of the city's most significant privately held enterprises.[1]

History

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Origins (1901)

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Day & Zimmermann was founded in 1901:

Beginning:

  • Charles Day and John Zimmermann founded company
  • Engineering consulting origin
  • Philadelphia base
  • Industrial focus

Early Engineering

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Initial business:

  • Power plant engineering
  • Industrial consulting
  • Utility industry work
  • Growing reputation

World War I

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Defense entry:

  • Munitions production began
  • Government contracts
  • Expanded capabilities
  • Strategic importance

Yoh Family Acquisition (1961)

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New ownership:

  • Harold Yoh acquired company
  • Family ownership began
  • Professional management
  • Diversification strategy

Growth

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Expansion:

  • Staffing business added
  • Defense growth
  • Engineering expansion
  • National presence

Business Segments

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Munitions and Defense

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Government services:

  • Ammunition production
  • Munitions demilitarization
  • Weapons systems maintenance
  • Government contractor

Engineering and Construction

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Industrial services:

  • Power generation
  • Nuclear facility support
  • Industrial construction
  • Maintenance services

Yoh Staffing

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Workforce solutions:

  • Technical staffing
  • Engineering placement
  • IT staffing
  • Contract employees

Operations

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Munitions

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Defense work:

  • Operates Army ammunition plants
  • Munitions production
  • Demilitarization
  • Critical defense contractor

Power Industry

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Engineering:

  • Nuclear power plant services
  • Fossil fuel plants
  • Maintenance and outages
  • Technical support

Staffing

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Yoh brand:

  • Technical and engineering staffing
  • Contract and direct hire
  • National presence
  • Fortune 500 clients

Philadelphia Headquarters

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Spring Garden Location

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Corporate base:

  • 1500 Spring Garden Street
  • Center City Philadelphia
  • Long-term presence
  • Family commitment to city

Employment

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Local jobs:

  • Headquarters staff
  • Regional operations
  • Professional positions
  • Community employer

Yoh Family

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Family ownership:

  • Three generations
  • Philadelphia connection
  • Long-term thinking
  • Civic involvement

Company Culture

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Family Ownership

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Private company:

  • No public shareholders
  • Long-term perspective
  • Values-driven
  • Employee focus

Safety Focus

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Core value:

  • Munitions require safety culture
  • Zero harm goal
  • Training emphasis
  • Recognition programs

Community

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Engagement:

  • Philadelphia philanthropy
  • STEM education support
  • Community partnerships
  • Employee volunteering

Industry Position

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Defense Contractor

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Scale:

  • Major ammunition producer
  • Government contracts
  • Critical capabilities
  • Long-term relationships

Engineering

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Specialization:

  • Nuclear industry expertise
  • Power generation
  • Industrial maintenance
  • Technical services

Staffing

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Market position:

  • Technical staffing leader
  • National footprint
  • Fortune 500 clients
  • Growing sector

Challenges

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Government Contracts

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Dependencies:

  • Government budget cycles
  • Contract competition
  • Political factors
  • Regulatory requirements

Labor Market

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Workforce:

  • Technical talent competition
  • Training requirements
  • Retention challenges
  • Skills gaps

Industry Changes

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Evolution:

  • Energy industry transition
  • Defense priorities
  • Technology changes
  • Market dynamics

Leadership

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Yoh Family

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Ownership:

  • Three generations since 1961
  • Family governance
  • Philadelphia commitment
  • Long-term vision

Management

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Professional leaders:

  • Segment presidents
  • Operational expertise
  • Industry veterans
  • Board oversight

Future

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Strategy

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Direction:

  • Core business focus
  • Government services
  • Technical staffing growth
  • Strategic investments
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Opportunities:

  • Defense spending
  • Infrastructure investment
  • Technical skills demand
  • Energy sector services

See Also

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References

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  1. ↑ "Day & Zimmermann". Day & Zimmermann. Retrieved December 31, 2025
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