The 20 Best Mobile Learning Apps for Children John Spencer Friday, December 07, 2012 26 Comments Edit You can also access it here. Which apps did I miss? SHARE SHARE SHARE John Spencer John Spencer is a teacher, author, speaker, and incessant doodler. He is the co-author of Wendell the World's Worst Wizard and the co-founder of Write About. He is passionate about helping students develop into better writers and deeper thinkers.