American biographer, critic, and poet. He is probably best known for having shepherded the boisterous Welsh poet Dylan Thomas (Thomas, Dylan) through the United States on his speaking tours.

At the age of four Brinnin moved with his American parents from Canada to Detroit, Michigan. He attended Wayne (later Wayne State) University, the University of Michigan (B.A., 1941), and Harvard University (1941–42). His first book of poems, The Garden Is Political, was published to considerable acclaim in 1942; his seventh and last, Skin Diving in the Virgins and Other Poems, was published in 1970. He also began a long teaching career in 1942. Although he once had defeated the better-known poet John Berryman (Berryman, John) for a poetry prize, Brinnin eventually came to prefer other genres. While serving as director of the Poetry Center of the Young Men's and Young Women's Hebrew Association (YM-YWHA), Brinnin arranged for Thomas's first performance in the United States in 1949. Brinnin's sympathetic response to the alcoholic poet led to a relationship that lasted until Thomas's death some four years later. Brinnin's description of these experiences, Dylan Thomas in America: An Intimate Journal (1955), presented in detail the greater poet's womanizing and drinking. Brinnin found the relationship disquieting, and he quit his post at the YM-YWHA. In the following years he wrote a number of books, including The Third Rose: Gertrude Stein and Her World (1959), a biography of Gertrude Stein (Stein, Gertrude); Sextet: T.S. Eliot & Truman Capote & Others (1981), a series of vignettes on T.S. Eliot (Eliot, T.S.), Truman Capote (Capote, Truman), Elizabeth Bowen (Bowen, Elizabeth), and others; and three histories of North Atlantic steamships (he was an inveterate traveler). He also edited three anthologies of 20th-century American and British poetry and Emily Dickinson: Poems (1960).