Mark Meretzky has been teaching Unix, C++, Java, JavaScript, Ruby on Rails, iOS, and Android since 1990 at the New York University School of Continuing and Professional Studies. He has taught Calculus at NYU, C++ in Harlem, and Zilog Z-80 assembly language on the original Radio Shack TRS-80. He was also one of the operators of the Andrus Planetarium at the Hudson River Museum in Yonkers, NY.