After moving to Harlem, Marvel Jackson Cooke became an editorial assistant for W. E. B. Du Bois at The Crisis.
Founded in 1910, The Crisis was published by the National Association for the Advancement of Colored People (NAACP) and served as an outlet for Black communities to express their views on politics and civil rights advocacy. Du Bois recognized Cooke’s talent and mentored her, putting her in charge of a column called "In the Magazines," where she critiqued leading literary publications. She reviewed works by Langston Hughes, Dorothy Parker, and Zora Neale Hurston, and mingled with the prominent poets, playwrights, authors, artists, and musicians of the Harlem Renaissance.