About Us Maryland, Virginia, and Washington, D.C. 410-205-9040
Established in 1955 by the late Thurman D. Donovan, T. D. Donovan, Landscape Architects rapidly became known for their balance between modern aesthetics and historic preservation. Joined in 1965 by Richard T. Feola and in 1971 by Andrew H. Balderson, they continued to evolve and by 1977 became known as Donovan • Feola • Balderson & Associates, Inc.. Richard T. Feola retired in 2001 after 36 years with the firm.

Andrew Balderson served at the helm for 18 years, until 2019 when he sold the business to Colleen Vacelet, former DFB landscape architect and current president/owner of Intreegue Design. Intreegue Design is a woman-owned licensed landscape architecture firm with expertise extending beyond design to include arboriculture, horticulture, forest conservation, storm water management, LEED, and construction oversight. Mr. Balderson continues to work and consult with the team at Intreegue Design, serving as a senior landscape architect, managing both legacy DFB projects and new projects.

Donovan Feola Balderson, now part of Intreegue Design, offers professional landscape architecture and site planning services that accommodate the needs of our diverse and discerning clientele. We have the capacity to execute large-scale landscape architecture projects and the commitment to give each client individual care.
Landscape Architecture
As an Award Winning Landscape Architecture Firm, we are recognized as a firm that creates mature landscapes that gracefully evolve over time. Our experienced landscape architects select the appropriate, large specimen trees and shrubs to achieve the desired scale and appearance of a mature landscape.
Site Planning
DFB & Associates, Inc. is instrumental in the site planning process of many commercial, residential, public works, historic, and institutional projects. When a project poses complex challenges, our 65 years of experience is invaluable. Additionally, we concentrate on sustainable landscapes that are simultaneously aesthetic and eco-friendly. Our landscape services include Forest Conservation Planning, Sustainable Landscape Design, & Green Roof Design.

Multidisciplinary Collaboration
DFB & Associates, Inc. collaborates with other disciplines to maximize the quality of your landscape. We work with architects and engineers, environmental consultants, arborists, builders and contractors, sculptors, and fellow landscape architects.

Donovan • Feola • Balderson & Associates, Inc. (now part of Intreegue Design)
Andrew H. Balderson, RLA, President
Andrew H. Balderson has been a principal partner with Donovan, Feola, Balderson & Associates since 1977. He is a registered landscape architect in Maryland and 8 other states. Mr. Balderson is responsible for overseeing all phases of project design, development and installation. His 40 years of experience in the tree growing industry, selecting and installing large caliper specimen trees has been of great importance to his clientele.

He is personally involved with all the firm�s historic projects. He has directed the design and construction of the most recent landscape improvement projects funded by the late Robert H. Smith at the University of Maryland and the Wilmer Eye Institute. In the summer, he�s been known to slip away to his cottage on Lake Charlevoix in Michigan to pursue his passion for fly fishing and golf.
Mr. Balderson is pictured above examining the “Bloodgood” Japanese Maple he received as a seedling presented by Rosalynn Carter in the Rose Garden at the White House in 1979. This was the award DFB received from the American Association of Nurserymen for the Martin Marietta Corporate Headquarters, Bethesda, MD. He has nurtured this tree for 38 years as seen here at his farm in Laytonsville, Md.   Download Andrew's Resume

Call 410-205-9040 or click for expert Landscape Architecture and Site Planning.
DFB & Associates, Inc., now a part of Intreegue provides Landscape Architecture and Site Planning throughout the Mid Atlantic United States. We are located in Laytonsville, Maryland and our breadth of service includes clients in the Washington D.C. and Baltimore Metro Areas; Great Falls, Mclean, and Upperville, Virginia; Annapolis Easton, Frederick and Hagerstown, Maryland.


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