Katherine has illustrated nine children's books, two of which she also wrote. MY MOTHER THE CAT was a Children's Choice selection by the Children's Book Council. SPIKE, her other author/illustrator book, was a finalist in the PEN West children's literature category. NAMING THE CAT, written by Laurence Pringle, was part of the Society of Illustrators Original Art exhibition.

As a volunteer for New York Cares, Katherine has created murals for a public school and a senior residence. She lives in the Washington Heights neighborhood of Manhattan with her husband, writer John H. Richardson.