Although I'm best known for my "Who Pooped?" books, which have sold over 400,000 copies, I have also written a number of technical nonfiction books, focusing on accessibility technology for deaf and hard-of-hearing people--specifically closed captioning and CART reporting.My two newest books, as of May 2016, are "Gary's Guide to Successful Book Signings" and "Who Pooped in Central Park?"I've also published over 300 articles in various magazines, newspapers, and Web sites, ranging from "The National Law Journal" to "Blacklisted! 411" (a hacker magazine), and from "Newswaves For Deaf and Hard-of-Hearing People" to "VLSI Design" (a chip design magazine).I have taught computer science at three colleges, and currently own a bookstore in Montana.