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A 30-year retrospective of his sculpture was held in 1993 at the Neuberger Museum of Art in Purchase, New York.
Kellard is represented in the collections of the American Visionary Art Museum in Baltimore, Maryland, the Museum of Contemporary Religious Art (MOCRA) at Saint Louis University, St. Louis, Missouri, Prudential Insurance Company in Newark, New Jersey, the New Jersey State Museum in Trenton, New Jersey, the Grey Art Gallery and Study Center of New York University in New York City and the Neuberger Museum of Art in Purchase, New York.
Gerrit Henry, "Roger Welch", Art in America, December 2001, review of Neuberger Museum of Art exhibition, page 128 ill.