Here's why:
* Biographer: Eliot wrote a biography of John Dryden, a 17th-century poet and literary critic.
* Historian: Eliot's poems often engaged with historical themes and figures, reflecting his interest in the past and its impact on the present. His work often tackled the themes of tradition, culture, and the decline of Western civilization.
* Poet: T.S. Eliot is widely regarded as one of the most influential poets of the 20th century. His works, like "The Waste Land" and "The Love Song of J. Alfred Prufrock," are cornerstones of Modernist literature.
While other authors from the Modernist period were also poets, historians, or biographers, Eliot is the most prominent example of someone who excelled in all three areas.