David Plummer & Associates Joins LJA

Natick, MA (June 6, 2025) – David Plummer & Associates (DPA), a civil engineering firm based in Coral Gables, Florida, with an additional office in Fort Myers, Florida joins LJA, a nationally recognized, full-service, multidisciplinary engineering and consulting firm, expanding firm’s presence in South Florida.

This strategic move strengthens LJA’s presence in Florida and positions the company for continued growth in key markets throughout Florida.

For more than four decades, DPA has been a trusted partner in delivering iconic, community-shaping projects across south Florida. Founded in 1978 and led today by Tim Plummer, PE, President of DPA, the firm has built a legacy rooted in creativity, collaboration, and deep client relationships. Many of its employees have been with the firm for 20, 30, even 40+ years – a rare testament to the strong culture and loyalty within the company.

“My father started this firm, and over the years, we’ve built something truly special—a place where people feel like family,” said Plummer. “When we began looking at potential partners, LJA stood out. It just felt right. Their values align with ours: loyalty, creativity, collaboration, and a people-first culture.”

Plummer emphasized that joining LJA marks an exciting new chapter for both clients and employees. “This is a tremendous opportunity for our clients and employees. We are excited to become part of a company that shares our values and vision for our employees and for the continued growth of south Florida. We look forward to leveraging LJA’s resources and expertise to explore new opportunities and deliver enhanced services to our clients.”

Nationally recognized as a Best Place to Work, LJA offers a strong cultural and operational fit for DPA. Now, backed by LJA’s expanded resources and a broader network, DPA is positioned to provide even greater value to clients while maintaining the same commitment to excellence that has defined its success.

“The addition of the DPA team is an exciting milestone for our company,” said James Ross, PE, President and CEO of LJA. “South Florida is a dynamic and growing market. We gain a talented team with deep local knowledge and relationships by joining forces with DPA. This allows us to serve our clients better and pursue larger, more complex projects throughout the region.”

With more than 50 years of experience, LJA has established itself as a leader in engineering, planning, environmental, and survey services, particularly in transportation, land development, and public works. The firm’s employee-owned structure, with over 2,700 employee-owners, fosters a culture of innovation and collaboration, driving its continued success.

Morrissey Goodale, a specialized management consulting and research firm exclusively serving the architecture, engineering, and environmental consulting industries, initiated and advised David Plummer & Associates in the transaction.