Irwin Allen Ginsberg was an American poet and one of the leading figures of both the Beat Generation of the 1950s and the counterculture that soon would follow. He vigorously opposed militarism, economic materialism and sexual repression and was known as embodying various aspects of this counterculture, such as his views on drugs, hostility to bureaucracy and openness to Eastern religions. He was one of many influential American writers of his time known as the Beat Generation, which included famous writers such as Jack Kerouac and William S. Burroughs.

Ginsberg is best known for his poem "Howl", in which he denounced what he saw as the destructive forces of capitalism and conformity in the United States. In 1956, "Howl" was seized by San Francisco police and US Customs. In 1957, it attracted widespread publicity when it became the subject of an obscenity trial, as it described heterosexual and homosexual sex at a time when sodomy laws made homosexual acts a crime in every U.S. state. "Howl" reflected Ginsberg's own homosexuality and his relationships with a number of men, including Peter Orlovsky, his lifelong partner. Judge Clayton W. Horn ruled that "Howl" was not obscene, adding, "Would there be any freedom of press or speech if one must reduce his vocabulary to vapid innocuous euphemisms?"

In Ginsberg's freshman year at Columbia he met fellow undergraduate Lucien Carr, who introduced him to a number of future Beat writers, including Jack Kerouac, William S. Burroughs, and John Clellon Holmes. They bonded because they saw in one another an excitement about the potential of American youth, a potential that existed outside the strict conformist confines of post–World War II, McCarthy-era America. Ginsberg and Carr talked excitedly about a "New Vision" (a phrase adapted from Yeats' "A Vision"), for literature and America. Carr also introduced Ginsberg to Neal Cassady, for whom Ginsberg had a long infatuation. In the first chapter of his 1957 novel On the Road Kerouac described the meeting between Ginsberg and Cassady. Kerouac saw them as the dark (Ginsberg) and light (Cassady) side of their "New Vision", a perception stemming partly from Ginsberg's association with communism, of which Kerouac had become increasingly distrustful. Though Ginsberg was never a member of the Communist Party, Kerouac named him "Carlo Marx" in On the Road. This was a source of strain in their relationship.