Press enter to activate the dialog and use the tab key to navigate through the options.

Duffield Associates, Inc. Company Logo
  1. Top Workplaces
  2. Duffield Associates, Inc.

Duffield Associates, Inc.

Established in 1976, Duffield Associates is a diverse and dynamic mid-sized engineering and science consulting firm, which has grown to include a professional and technical staff of over 100 individuals, including over 30 licensed Professional Engineers, Professional Geologists, and Landscape Architects. The firm's headquarters is located in Pike Creek Valley outside of Wilmington, DE. We have regional offices in Dover and Rehoboth, DE; Philadelphia and Carlisle, PA; Cinnaminson and West Deptford, NJ; and Bel Air, MD. Duffield practices extensively in the areas of: Civil Engineering, Geotechnical Engineering, Water and Wastewater Engineering, Water and Natural Resources, Environmental Services, Structural Engineering, Municipal Services, Construction Services, Traffic/Transportation Engineering, Coastal/Waterfront Engineering, Permitting Assistance.... Read more


To make Duffield an enjoyable place to work and encourage collaboration that's needed to develop uniquely creative, and value-added solutions, for our clients’ projects.... Read more


To enhance our community one project at a time.... Read more


To enhance our community one project at a time.... Read more

Additional Culture Details

Duffield Associates’ mission and the phrase that we live by, “enhancing our community one project at a time” is the cornerstone of the Duffield culture. The word “enhancing” acknowledges that real world problems are complex and require leveraging the full suite of diverse technical capabilities that Duffield offers. Collaboration is needed to develop uniquely creative and value added solutions for clients’ projects. “Community” represents not only clients and fellow Duffield colleagues, but also extended families who depend on us and the communities where we live and work. Additionally, it includes the professional community, which we strive to advance every day by adhering to high levels of professionalism and attracting other talented professionals.

Jesper Lowgren said, “An extraordinary business starts with extraordinary people. Extraordinary people start with purpose.” Duffield has been both adept and fortunate at developing much of its staff from within. While strategic technical and leadership hires may occur from the outside, there is a focus on cultural consistency and a commitment to Duffield’s unique culture. When new staff are welcomed, Duffield is candid and proud of the company culture, expectations, and professional growth opportunities.

Culture is a subject of extreme pride and focus at Duffield Associates, Inc. Duffield is entrusted with professional and ethical obligations to the public health and welfare, yet also the need to be a viable business. Differing from other firms, Duffield is much more technically diverse than smaller firms to enable work on complex projects, yet much more collaborative than the much larger regional and national firms, such that Duffield staff routinely work together across technical disciplines. Duffield’s culture has necessarily grown over time to support this niche.
... Read more


Be a Consultant, Not an Engineer
The quality of our results depends on the depth of our understanding. We ask “why” to gain this understanding in order to develop elegant solutions. Clients may not explicitly know nor be able to articulate what they need, and that requires us to spend quality time up front to assure mutual understanding.


Wilmington, DE


101 US Employees



Recent Awards