OvS is an award-winning practice of landscape architecture based in Washington, DC. The firm, a Certified Business Enterprise, draws upon over four decades of engaging and sustainable place-making in the public and private realms. OvS believes strongly in the collaborative process and maintains a built portfolio that demonstrates what is possible when art, science and environmental sensitivity equally drive design. The firm’s diverse mix of commissions ranges from urban corridors, monumental civic spac­es and institutions, to estates and urban residences. These outdoor spaces are programmed for a variety of active and passive uses and offer a humanizing connection to the land and surrounding context.

In 2014, OvS was awarded the American Society of Landscape Architects’ Landscape Architecture Firm Award. The award recognizes a “distinguished body of work that influences the professional practice of landscape architecture.”


Lisa E. Delplace

Lisa’s extensive knowledge of ecological processes and her deep commitment to their artistic execution result in a strong sculptural relationship between architecture and landscape.
Read Lisa’s Bio

Eric D. Groft

Eric has over 30 years of experience in residential, commercial and institutional work. Eric’s frequently published design accomplishments.
Read Eric’s Bio

Sheila A. Brady

Sheila’s design achievements include many of the firm’s distinguished projects. Recent work includes the Native Plant Garden and the Azalea Garden at New York Botanical Garden.
Read Sheila’s Bio


Wolfgang Oehme and James van Sweden launched their partnership in 1975 in the basement of Jim van Sweden’s Georgetown row house.

Their collaboration has been credited with founding the ‘New American Garden’ style of landscape architecture. The style is characterized by large swaths of grasses and layered masses of perennials that boldly celebrate the ephemeral through mystery, intrigue, and discovery. Jim van Sweden said the New American Garden is “Vigorous and audacious…vividly blending the natural and the cultivated.”

Their design credits include the planting along Pennsylvania Avenue from the U.S. Treasury to the National Gallery in Washington, DC; the Virginia Avenue Gardens of the Federal Reserve in Washington, DC; the National World War II Memorial in Washington, DC; the Gardens of the Great Basin at the Chicago Botanic Garden; as well as numerous residential gardens in the United States and abroad.

Wolfgang Oehme passed away in December 2011 and Jim van Sweden passed away in September 2013.


The Artful Garden

by James van Sweden & Tom Christopher


Architecture In The Garden

by James van Sweden


Bold Romantic Gardens

by Wolfgang Oehme & James van Sweden


Gardening With Nature

James van Sweden


Gardening With Water

James van Sweden


Process Architecture

Wolfgang Oehme & James van Sweden

Randy’s Retreat

by Alejandro Saralegui
Hamptons Cottages & Gardens
August 2013

Artful Design

by Mallory Evans
luxe interiors+design (Washington, DC)
Summer 2013

Rubbing Out the Footprints

by Elizabeth Evitts Dickinson
The New York Times
July 11, 2013

Serenity on the South River

by Robert Haywood
Annapolis Home, Vol.4
No.3, 2013

The New Native Plant Garden at NYBG

by Lynne Hoffman
The American Gardener
May/June 2013

TA Landscape, and a Concepts, for All Seasons

by Edward Rothstein
The New York Times
May 3, 2013

By Land & By Sea

by Meghan Druedling
Residential Architect
July/August, 2012

Baywatch: Weekend Retreat Brings Guests to the Water’s Edge

by G. Martin Moeller
Summer 2012

Refuge on the River

by Steve Bender
Southern Living
May 2012

MLK Memorial Fit in with It’s Surroundings

by Michael E. Ruane
The Washington Post
March 14, 2012