His drawings have appeared in The New Yorker, The New York Times Magazine, and McSweeney's, among other publications. Ivan has published many acclaimed books for adults, including Cartooning: Philosophy and Practice. Wordplay, his first book for children, shows kids how to imagine compound words as the words that comprise them. His upcoming 3x4,which will be published by Toon Books (distributed by Consortium) in September 2018, also encourages them to visualize playfully--this time with numbers.