Walt Whitman is widely regarded as the father of free verse poetry, primarily due to his groundbreaking work, \"Leaves of Grass,\" which challenged traditional poetic forms and structures.

e.e. cummings is renowned for his unconventional use of language, typography, and punctuation in his free verse poems, creating a unique and distinctive style.

Langston Hughes is known for his powerful and moving free verse poems that address issues of racial inequality, social injustice, and the African American experience.

Ezra Pound is credited with co-founding the Imagist movement, which advocated for the use of clear and concise imagery in poetry, often employing free verse as its medium.

Sylvia Plath's free verse poems are characterized by their intense emotional depth and confessional style, delving into personal experiences and themes of love, loss, and the search for identity.

William Carlos Williams is celebrated for his free verse poems that depict the ordinary moments and objects of everyday life, finding beauty and significance in the seemingly mundane.

T.S. Eliot's free verse poems frequently delve into mythological, historical, and psychological themes, using fragmented and allusive language to create complex and thought-provoking works.

Allen Ginsberg is associated with the Beat Generation and is known for his free verse poems that break away from conventional structures, employing stream-of-consciousness writing and unconventional language.

Lewis Carroll, known for his \"Alice in Wonderland\" books, also wrote free verse poems that are marked by their playful and nonsensical use of language, creating a sense of wonder and absurdity.

Gary Snyder's free verse poems often draw inspiration from nature and Eastern philosophy, exploring the interconnectedness of all living things and the importance of living in harmony with the environment.

Adrienne Rich's free verse poems are characterized by their strong political and social commentary, addressing issues of gender inequality, oppression, and the experiences of marginalized communities.

Frank O'Hara's free verse poems often delve into themes of identity, sexuality, and the complexities of human relationships, using a conversational and intimate tone.

Federico García Lorca's free verse poems are characterized by their surreal and dreamlike imagery, often exploring themes of love, death, and the subconscious.

Elizabeth Bishop's free verse poems often grapple with themes of loss, grief, and the search for meaning in the face of adversity, using precise and evocative language.

John Ashbery's free verse poems often experiment with typography and layout, creating visual and spatial effects on the page that contribute to the meaning and impact of the poem.