In 1942, Grant went to work for a commercial film company and during World War II made navy training films. Soon thereafter, he began doing scientific illustration and making teaching films for the medical profession. Although he continued to paint and draw independently, his career in medical films took precedence, and until the mid 1970s, he exhibited his creative work only on rare occasions.
In New York in the early 1940s, Grant was friendly with John Sennhauser, Jean Xceron, Irene Rice Pereira, and others associated with the Guggenheim Foundation. However, he did not become actively involved with either the American Abstract Artists or other organizations that provided an artistic or political forum for practicing artists. His own vision had developed independently, and although his paintings bear some resemblance to those of Kandinsky, his interest in balance and rhythm grew intuitively rather than as the result of a theoretical searching for new forms of expression.% | % | % | % | % | % | % | % | % | %