Charley Harper was a Cincinnati-based American Modernist artist, best known for his highly stylized wildlife prints, posters and book illustrations.
I fell in love with his work during a visit to the Cornell Lab of Ornithology in Ithaca, New York. He designed their logo and many pieces of his art sold at the lab gift shop. I bought a t-shirt, bird poster and a children's book How to Draw 28 birds in Harper's Style. His online store is doing a great job promoting his work.
Designer Todd Oldham produced several films and books about Mr. Harper to help make sure his legacy lives on. I've embedded two of the films and a brief introduction sourced from Wikipedia.