Terrence J. DeWan & Associates is a professional landscape architectural and planning firm in Yarmouth, Maine dedicated to approaching land use opportunities with creativity, environmental sensitivity, and an awareness of client needs.

The staff of eight is composed of professionals with backgrounds in landscape architecture, recreation planning, land planning, visual resource assessment, permitting, graphic design, model making, research, and technical writing.

tjd&a is committed to appropriate design solutions that evolve from effective communication with the client and municipal and state officials. The firm has an underlying commitment to land stewardship and faith in the future of New England.

The services offered by the firm include:

Site Planning and Design

Site analysis; single family homes; residential subdivisions; cluster housing; apartment and condominium complexes; land reclamation; commercial, institutional, and industrial site planning; landscape restoration.

Master Planning

Site selection studies; open space planning; campus planning; waterfront planning; municipal comprehensive planning; zoning and land-use studies; resort communities; resource management studies; natural resource inventories.

Recreational Planning

Municipal inventories; waterfront land use studies; park, playground and facility design; trail planning; recreation management.

Downtown Revitalization

Community design forums; streetscape improvements; urban plantings, lighting, and signage design; corridor planning; pedestrian amenities.

Visual Inventories and Assessment

Scenic inventories; facility siting; highway location studies; transmission line studies; windpower visual studies, visual impact assessments; mitigation planning.


Coordination of applications under Maine's NRPA (Natural Resource Protection Act), Maine Department of Environmental Protection (DEP) Site Location of Development Permit, and Army Corps of Engineers Permits.

Construction Documentation and Administration

Complete Construction Documentation; Specifications; Bid Packages; Construction Administration.

tjd&a Terrence J. DeWan & Associates

121 West Main Street
Yarmouth, ME 04096
t  207.846.0757
f  207.846.0675
e  dewan@tjda.net


Judy Colby-George


GIS Expert

Judy is the owner of tjd&a and Spatial Alternatives, GIS Consultants.  She has over 30 years of experience helping clients to implement GIS and engage in complex spatial issues.  Judy has extensive experience with public participation GIS and working with clients to understand the spatial relationships of various policies and programs.  Her experience includes working with municipalities, regional planning agencies, state agencies, private firms, and utility companies.  Judy believes that GIS is a tool that can help to engage the public in the messy problems that face our world today, she works with clients to tell their stories, represent data in an understandable format, and invite a variety of people to the decision making process.

Terrence J. DeWan FASLA


Maine Licensed Landscape Architect

Terry DeWan has over 40 years of professional experience in landscape architecture, visual resource assessment, site planning, design guidelines, and community development. His experience includes work with communities, state agencies, private developers, utility companies, and the forest products industry in New England. He has written numerous studies on community planning, visual impacts, recreation planning, water access, and highway corridor redevelopment.

Eileen Butler


Business Manager

Eileen Butler's experience with business administration includes: contract reviews, project analysis, client billing, payroll management, personnel and insurance administration as well as property management issues. She enjoys tracking the numbers and overseeing the different areas of the business.

Steve Thompson

Maine Licensed Landscape Architect

Since joining TJD&A in 2013, Steve's work experience has included site planning, photosimulations, rendering, construction documentation, and ArcGIS mapping. Steve graduated with High Honors from The University of Rhode Island, and has a background in Fine Gardening and Landscape Construction.

Danielle Matkoskey

Landscape Designer

Danielle's experience includes computer generated modeling, photosimulations, rendering, assisting with visual impact assessments, site planning and planting design. She has proficiency in numerous technical software programs.

Jessica Wagner Kimball

Maine Licensed Landscape Architect/Planner

Jessica came to TJD&A in 2014 with a background in both Planning and Landscape Architecture. She has experience in the public sector as a planner for the Town of Old Orchard Beach, and in the private sector as a member of Sasaki Associates. Jessica completed a graduate degree in Landscape Architecture at the University of Toronto in 2013. Her graduate thesis work was an adaptive design strategy to deal with the effect of climate change and rising sea levels for Portland's commercial waterfront, which was exhibited at The Portland Society of Architecture 'Waterfront Visions 2050' symposium in 2013.


American Society of Landscape Architects

Terry DeWan inducted into the Council of Fellows 2011

Merit Award, Los Angeles River Greenway, Landscape Architecture Foundation, Client: Trust for Public Land

Merit Award, Chattahoochee Riverway, Landscape Architecture Foundation. Sponsor: Atlanta Urban Resources Partnership


Boston Society of Landscape Architects

Central Gardens Master Plan, Coastal Maine Botanical Gardens, Boothbay, Maine. BSLA Merit Award for Landscape Analysis and Planning – Park Planning With EDAW (now AECOM). 2006.

“From the River to the Bay”, A Parks, Recreation and Open Space Plan For Brunswick, Maine. BSLA Merit Award for Planning. 2003.

Terrence DeWan: 2002 Professional Excellence Award


Colorado Chapter, American Society of Landscape Architects

Coastal Maine Botanical Gardens, Central Gardens Master Plan, Boothbay, Maine, 2006 Presidents Award of Excellence for Planning and Urban Design. With EDAW (now AECOM).


Northern New England Chapter of the American Planning Association

Kancamagus Scenic Byway, Preliminary Facilities and Interpretive Media Plan, White Mountain National Forest, New Hampshire, Outstanding Project of the Year.

Knightville-Mill Creek Vision Plan, South Portland, Maine, Outstanding Project of the Year


Maine Association of Planners

Scenic Assessment Handbook, Maine State Planning Office, Maine Coastal Program

Two Echo Co-housing, Brunswick, Maine

Livability Guide to the Great American Neighborhood, Maine State Planning Office

Maine Street Revitalization Plan, Brunswick, Maine

Portland Shoreway Access Plan, Portland, Maine

Portland Waterfront Walk, Portland, Maine

Re-Use Plan for Regional Waste System’s Balefill Facility, Scarborough, Maine


Vermont Planners Association

Transit-Oriented Design (TOD) for Chittenden County, Guidelines for Planners, Policymakers, Developers and Residents. Chittenden Country Regional Planning Commission. With Wilbur Smith Associates. Project of the Year Award.


National Association for Interpretation

Great Bay National Estuarine Research Reserve, Sandy Point, New Hampshire, Interpretive Media Award.