 He has subsequently published two additional books, "How to Talk to Moms" and "How to Talk to Dads".He released his fourth book, "How to Talk to Santa", in 2009, and a fifth book, "Rules for School", in 2010.He appeared on "The Ellen DeGeneres Show" in February, and December 2008 and April 2009, and on NBC's "Late Night with Conan O'Brien" in December 2008.