Josh Oaktree (author) is the managing director and founder of Oak Tree Comics, an independent publisher where imagination meets environmentalism. His award-winning books for young and middle-grade readers include the Art & Oakie Ask series, A Good Planet is Hard to Find, Thorn the Unicorn, and The Weird Animal Hour. He holds his MFA in screenwriting from the American Film Institute. Originally from the Philadelphia area, Josh lives in sunny Los Angeles. You can visit Josh at joshoaktree.com. Bruna Martins is a Brazilian illustrator and graphic designer based in São Paulo. She holds a degree in Architecture and Urbanism from the University of São Paulo (USP) and has illustrated several children's books published in Brazil.

Sloth & Hummingbird, published by Oak Tree Comics, is her first book released in the United States. Alongside children's publishing, she creates editorial illustrations for magazines and educational materials, with a body of work inspired by nature, childhood, and Brazilian biodiversity.