What is Africa to me: Copper sun or scarlet sea, Jungle star or jungle track, Strong bronzed men, or regal black Women from whose loins I sprang When the birds of Eden sang? One three centuries removed From the scenes his fathers loved, Spicy grove, cinnamon tree, What is Africa to me?“ ” From "Heritage" 
This 1920s artistic movement produced the first large body of work in the United States written by African Americans. However, Cullen considered poetry raceless, although his poem "The Black Christ" took a racial theme, lynching of a black youth for a crime he did not commit. Countee Cullen was very secretive about his life. His real mother did not contact him until he became famous in the 1920s.
The movement was centered in the cosmopolitan community of Harlem, in New York City. During the 1920s, a fresh generation of writers emerged, although a few were Harlem-born. Other leading figures included Alain Locke (The New Negro, 1925), James Weldon Johnson (Black Manhattan, 1930), Claude McKay (Home to Harlem, 1928), Hughes (The Weary Blues, 1926), Zora Neale Hurston (Jonah's Gourd Vine, 1934), Wallace Thurman (Harlem: A Melodrama of Negro Life, 1929), Jean Toomer (Cane, 1923) and Arna Bontemps (Black Thunder, 1935). The movement was accelerated by grants and scholarships and supported by such white writers as Carl Van Vechten.
He worked as assistant editor for Opportunity magazine, where his column, "The Dark Tower", increased his literary reputation. Cullen's poetry collections The Ballad of the Brown Girl (1927) and Copper Sun (1927) explored similar themes as Color, but they were not so well received. Cullen's Guggenheim Fellowship of 1928 enabled him to study and write abroad. He met Nina Yolande Du Bois, daughter of W. E. B. Du Bois, the leading black intellectual. At that time Yolande was involved romantically with a popular band leader. Between the years 1928 and 1934, Cullen traveled back and forth between France and the United States.
When Cullen married Yolande Du Bois in April 1928, it was the social event of the decade, but the marriage did not fare well, and he divorced in 1930. It is rumored that Cullen was a homosexual, and his relationship with Harold Jackman ("the handsomest man in Harlem"), was a significant factor in the divorce. The young, dashing Jackman was a school teacher and, thanks to his noted beauty, a prominent figure among Harlem's gay elite. Van Vechten had used him as a character model in his novel Nigger Heaven (1926).
It's very possible that the conflicted Cullen was in love with the homosexual Jackman, but Thomas Wirth, author of Gay Rebel of the Harlem Renaissance, Selections from the Work of Richard Bruce Nugent, says there is no concrete proof that they ever were lovers, despite newspaper stories and gossip suggesting the contrary.
Jackman's diaries, letters, and outstanding collections of memorabilia are held in various depositories across the country, such as the Amistad Research Center at Tulane University in New Orleans and Atlanta University (now Clark Atlanta University) in Atlanta, Georgia. At Cullen's death, Jackman requested that the name of the Georgia accumulation be changed from the Harold Jackman Collection to the Countee Cullen Memorial Collection in honor of his friend. When Jackman, himself, succumbed to cancer in 1961, the collection was renamed the Cullen-Jackman Collection to honor them both.
By 1929 Cullen had published four volumes of poetry. The title poem of The Black Christ and Other Poems (1929) was criticized for the use of Christian religious imagery - Cullen compared the lynching of a black man to the crucifixion of Jesus.
As well as writing books himself, Cullen promoted the work of other black writers. But by 1930 Cullen's reputation as a poet waned. In 1932 appeared his only novel, One Way to Heaven, a social comedy of lower-class blacks and the bourgeoisie in New York City. From 1934 until the end of his life, he taught English, French, and creative writing at Frederick Douglass Junior High School in New York City. During this period, he also wrote two works for young readers: The Lost Zoo (1940), poems about the animals who perished in the Flood, and My Lives and How I Lost Them, an autobiography of his cat. In the last years of his life, Cullen wrote mostly for the theatre. He worked with Arna Bontemps to adapt Bontemps's 1931 novel God Sends Sunday into St. Louis Woman (1946, published 1971) for the musical stage. Its score was composed by Harold Arlen and Johnny Mercer, both white. The Broadway musical, set in poor black neighborhood in St. Louis, was criticized by black intellectuals for creating a negative image of black Americans. Cullen also translated the Greek tragedy Medea by Euripides, which was published in 1935 as The Medea and Some Poems with a collection of sonnets and short lyrics.
In 1940, Cullen married Ida Mae Robertson, whom he had known for ten years.
Cullen died from high blood pressure and uremic poisoning on January 9, 1946.
The Countee Cullen Library, a Harlem branch location of the New York Public Library, bears Cullen's name. In 2013, he was inducted into the New York Writers Hall of Fame.