The list of David Armstrong's achievements is impressive. Since1971, David has been represented by the Hammer Galleries in New York City, where he had eight "sold-out" one-man exhibitions. Other exhibits at Hammer Galleries have included a two-artist exhibition (1980), featuring David and John Denver, to benefit the Windstar Foundation - an organization promoting environmental harmony and world peace; and a major exhibition (children's cancer research benefit) in 1987, "Realism: A Continuing American Tradition," with artists Eric Sloane, Bob Timberlake, and Andrew Wyeth. In 1990, the American Farmland Trust Organization, a nonprofit organization dedicated to preserving our valuable agricultural resources, hosted a benefit exhibition of Armstrong's recent works at the Hammer Galleries.
In 1976, David assisted his friend and mentor, Eric Sloane, with the panorama mural project (75 feet, 3 story) at the National Air and Space museum, Smithsonian Institute, in Washington, D.C. At the early age of 32, Armstrong was honored with a 120-piece exhibition in Pennsylvania's state museum in Harrisburg. Armstrong's works are in major corporate and private collections, including a piece in the private library of former President Bush (a gift to the President from the late Dr. Armand Hammer).
David Armstrong lent his support to the conservation group, Frenchman Bay Conservancy (Ellsworth, ME), by providing a one-man exhibition benefit in Maine in August 1994.
In 1992, a collection of the artist's paintings representing "Vanishing American Craftsman" was exhibited at the Butler Institute of American Art. Following the exhibition, the entire collection of 16 works was donated to Bucknell University by a private art collector. The collection is on permanent display at the Weis Center for Performing Arts, Lewisburg, Pennyslvania. A major 30-year retrospective exhibition opened for two months in June 1995 at the Butler Institute of American Art (Youngstown, Ohio).
The documentary produced by the Public Broadcasting Centertitled, "Our Vanishing American Landscape, The World and Work of David Armstrong" aired on Earth Day, 1993, and has been shown on selected stations nationally.