Born in St. Louis, Missouri, of African descent the son of Mary and George Gunn, a labourer he was one of seven siblings. After his mother died, his family separated. Moses left home and rode the railroad at just 12 years old. He returned to St. Louis and attended school while living at the home of Jewel Richie, his English Teacher. He graduated from Tennessee State University after serving in the United States Army, then went to graduate school at Kansas University, gaining a master's degree. He taught briefly at Grambling College before attempting an acting career in NYC. He married Gwendolyn Mumma Landes in 1966, becoming stepfather to her daughter Kirsten Sarah Landes. They had a son, Justin Moses, in 1970 who became a musician and Composer in the Copenhagen-based band, "The Reverend Shine Snake Oil Co."