Mark has written over 10 books in the "For Dummies" series, in the subject areas of Math, SAT, LSAT, and ACT Test Prep, as well as Basic Math, Algebra and Logic.

Mark teaches courses on SAT test prep and ACCUPLACER test prep, as well as a private tutoring practice in the subject areas of Math and English.

Mark has taken his passion for teaching and his vision for simplified effective learning techniques by creating an online learning platform named "SimpleStep"