1938 A young electrical engineer,  Herbert S. Foth, organizes a small engineering company in Green Bay, Wisconsin.  In the first year, Foth had four members on the payroll.  Clients included several municipalities in northeast Wisconsin.

1939-early 1940s Foth and Patrick Boyd join forces as Foth and Boyd.  Company begins long term engineering relationship at Austin Straubel Field (now Austin Straubel International Airport)

Mid-1940s Civil engineer and long-time Brown County Highway Commissioner Arthur Porath becomes a partner.  Firm is renamed Foth, Boyd and Porath.

Late 1940s Firm employs approximately 24 people. Patrick Boyd leaves the partnership and the business continues as Foth & Porath, Inc.  Many municipal clients added during this time including the communities of Weyauwega, Coleman, Wisconsin Rapids, and Ashwaubenon, Wisconsin, continue with Foth to this day.

1950 Jack Horner, World War I pilot and former Federal Aviation Administration official, joins and forms affiliated company Foth, Porath &  Horner. Firm specializes in airport engineering and serves clients throughout the upper Midwest.

1952 Major fire destroys Foth & Porath offices in Green Bay.  Members move quickly to reestablish operations.

1960s Firm continues steady growth and establishes its first environmental laboratory to support clients' wastewater treatment needs.

1967 Joseph Van Dyke joins the firm, now known as Foth & Van Dyke and Associates, Inc.

1970s Foth & Van Dyke's business focus expands significantly to address growing environmental awareness.  Services include wastewater treatment, water supply and environmental studies. These services, combined with the firm's traditional civil engineering capabilities are the precursor to today's Foth Infrastructure & Environment, LLC

1974 Consulting Engineers' Council of  Wisconsin presents Foth & Van Dyke with an Engineering Excellence Award for completion of the $14 million Shawano Lake wastewater system.

1976 Firm's 45 members move to new 13,000 s.f. offices in Green Bay.

1980s Foth & Van Dyke and Associates continues to grow and diversify, adding offices in Milwaukee and Madison, Wisconsin.

1981 Joe Van Dyke's son, Steven, succeeds him as Chairman and CEO of the firm, and begins to diversify service offerings.

1982 A Food Plant Division is added to serve the process engineering needs of dairy and other food processing clients. Paper industry expertise also expands.  The combined resources become the Industrial Division of Foth & Van Dyke, now Foth Production Solutions, LLC.

1985 Employment reaches more than 300.

1990s Foth expands geographically throughout Illinois, Iowa and Minnesota.

2000- present Geographic expansion throughout the U.S., and business diversification continue.  Clients include Fortune 500 companies, as well as the U.S. Postal Service. Employment exceeds 500.

2006 Foth & Van Dyke changes the operating name of its parent company to Foth. Subsidiary companies include Foth Infrastructure & Environment, LLC; Foth Production Solutions, LLC; and Foth Asset Management, LLC.