Schoenherr was also very well known as a wildlife artist and children's book illustrator, with over forty books to his credit. Most of his black-and-white illustration work used the scratchboard technique, and he was long known as the only commercial artist who specialized in it. His paintings were often egg tempera, another unusual medium. Schoenherr also completed paintings for NASA. Schoenherr's knowledge of zoology was very useful in creating alien creatures. He was a member of the American Society of Mammalogists, the Society of Animal Artists, and the Society of Illustrators.