L. Leslie Brooke was a British illustrator and writer best known for children's picture books filled with expressive animals and visual humor. Working in pen and ink and watercolor, he gave familiar nursery material a distinctive liveliness. Johnny Crow's Garden became a particularly enduring example of his ability to tell a story through gesture, expression, and carefully observed comic detail.

Born Leonard Leslie Brooke in Birkenhead, he studied at the Royal Academy Schools and worked as a painter as well as an illustrator. An illness during a visit to Italy left him permanently deaf. His illustrations for Andrew Lang's Nursery Rhyme Book helped establish his reputation, and he also illustrated stories by Mrs. Molesworth.

Brooke's books include Johnny Crow's Party, The Golden Goose Book, Ring O' Roses, and later adventures in Johnny Crow's New Garden. Animals in his pictures retain recognizable movements while acquiring wonderfully human social habits. This balance gives the illustrations warmth without sacrificing their visual precision. His work remains part of a rich tradition of British picture-book art in which words, page design, and images cooperate to make reading an act of shared discovery.