Founded in 1994 by Marcia Vallier, VDA aspires to connect people with their environment through the integration of architecture and landscape, creating spaces that respond to the needs of the region’s natural systems, cultures, and communities.

We provide services in landscape architecture, planning, and urban design within a variety of project types and scales.


-Site & resource planning
-Design guidelines & design review
-Urban forest & landscape management plans
-Public outreach & community facilitation
-Design development, construction documentation & administration
-Visual simulation, visual impact assessment & mitigation planning
-Illustration, signage system design, communication packages & strategies


Marcia Vallier


Marcia Vallier has over 35 years of professional experience in the fields of landscape architecture and planning. Her areas of concentration include master planning and design guidelines, site design, community facilitation, construction documentation, project planning and management, all on a multitude of scales.

JC Miller

Principal | Partner

JC Miller’s project experience includes analysis, planning, design, and construction documentation for a wide variety of project types. His portfolio also includes education facilities, public parks, civic spaces, religious environments, historic landscape documentation and preservation, and residential gardens.