Graydon is both trained in and an exponent of the atelier method which emphasizes classical painting techniques and has remodeled color theories by Albert Munsell and Josef Albers to fit traditional painting methods. Parrish has lectured at the Clark Art Institute, the University of Hartford, the Austin Museum of Art and the Santa Barbara Museum of Art. His work is displayed in public collections including the New Britain Museum of American Art, the Butler Art Institute and the Blanton Museum of Art as well as the personal collections of Michael Huffington, Christopher Forbes and Carmen Dell’Orefice.