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1890
- In 1889, Martin Boldt opens a carpentry shop in Appleton, Wisconsin

1900
- Boldt establishes a reputation for craftsmanship and reliability, using a horse-drawn wagon to deliver finished goods to customers
- Martin's sons, Oscar J., Robert and Arthur, join the business

1920
- Boldt enters the Commercial construction market, but most work is still home-building
- Led by Oscar J. Boldt's strong talent for problem-solving and innovation, the company incorporates as the Oscar J. Boldt Construction Company
- As the Depression deepens, Boldt expands outside of Wisconsin and lands its first large Manufacturing construction project

1940
- Oscar C. Boldt joins the family business
- Boldt becomes a key player in the Manufacturing market

1950
- Oscar C. Boldt becomes CEO
- Boldt enters Education market

1960
- Boldt enters Industrial, Pulp and Paper Process, and Health Care markets
- Opens first branch office in North Central Wisconsin
- Incorporates innovative construction practices in Industrial and Process applications
- Becomes one of ENR's Top 300 nation's largest contractors

1970
- Boldt enters Saudi Arabia market
- Boldt pioneers Construction Management
- Boldt's early investment in IT pays off for customers
- Continues to climb to ENR's Top 200 nation's largest contractors
- Warren Parsons joins the company

1980
- Strong process and machinery experience positions Boldt as a leader in Manufacturing and Machinery construction
- Continues expansion of Midwestern presence
- Builds presence in southern US
- Warren Parsons is made President

1990
- Oscar C. Boldt becomes chairman and Tom Boldt becomes CEO
- Bob DeKoch joins as COO
- Lean journey begins
- Ranked in the Top 100 of ENR's nation's largest contractors
- ENR ranks Boldt #1 contractor in Pulp & Paper
- Boldt receives Green Contractor Award

2000
- Broad experience with large, highly complex Industrial projects leads to a growing position in the Power and Renewable Energy markets
- Charter member of Lean Construction Institute (LCI)
- In 2002, Bob DeKoch becomes president
- Boldt expands and strengthens Midwest presence
- In 2002, Boldt pioneers Integrated Lean Project Delivery® (ILPD®)
- Implements corporate commitment to sustainability
- Outstanding philanthropic corporation
- Becomes 1st general contractor to be accepted into the DNR Green Tier Program
- Boldt achieves 1 million man-hours without a lost-time accident

2005
- Integrates Building Information Modeling (BIM) technology
- Recognized for our strong business ethics - Received Torch Award for Business Ethics & Integrity
- Awarded largest project in history of the company (Sutter Health, $1 billion)
- Builds presence on the West Coast in Health Care
- In 2006, built "Greenest Building in the World" - Aldo Leopold Legacy Center
- Selected as one of "America's Safest Companies"
- Enters Wind market and erects over 600 wind turbines first year
- Becomes a Lean enterprise
- Ranked as one of the Top 100 Green Contractors
- Further evolution of BIM integration
- In 2009, Boldt forges more deeply into the California market moving north to Sacramento
- Boldt has signed an unprecedented seven tri-party agreements totaling more than $2 billion in construction value

2010
- Boldt awarded unprecedented three biomass power projects
- Boldt achieves 2,000,000 man-hours without a lost-time accident
- Boldt is awarded the second research tower at University of Wisconsin - Madison
- Continues on an aggressive growth path in Northern California

2011
- Boldt achieves 4 million man-hours without a lost-time accident
- Madison office relocates
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