Grigsby volunteered for
World War II in 1942 and served in the Army. Upon returning after the war, he eventually settled in
Phoenix, Arizona, where he spent much of his professional career. Starting in 1946 Grigsby served as the Founder and Chair of the Art Department at
Carver High School for eight years, followed by serving as the Chair of
Phoenix Union High School, once Carver High School closed due to desegregation. Grigsby, who joined
Alpha Phi Alpha fraternity while a student at Morehouse, was one of the seven founders of the alumni chapter of the fraternity in Phoenix, in 1949. In 1966, Grigsby became a professor in the School of Art at
Arizona State University. According to Dr. Laura Chapman, an art education consultant, his book "remains today, a landmark in literature of art education." She goes on to say "it was also the first to address issues and stakes for all students in respecting the heritage and diversity in American society."
Art and Ethnics was reprinted by the
National Art Education Association in 2000. As an educator Grigsby was known for encouraging students to use their cultural heritage to understand their own identities and to inform their art practice. Aside from teaching, Grigsby was an active community leader. He attributes his involvement to his experiences working for three months teaching art at the American Pavilion at the
World's Fair in Brussels in 1958. Following his time there, he began to start art programs in unlikely places, such as daycare centers and housing projects. He also worked to provide opportunities for young minority artists to exhibit their work. Additionally he started the "Arts in Job Development" program through the
Opportunities Industrialization Center Grigsby was a prolific artist who continued to create art even at the age of 93. According to Grigsby "a visual artist expresses himself/herself about human conditions, within a framework of design". Family is cited as one of his many inspirations, however other themes of social injustice and humanity are often present in his work as well. == Selected exhibitions ==