Gary Litvin has worked in many areas of software development including artificial intelligence, pattern recognition, computer graphics, and neural networks.  As founder of Skylight Software, Inc., he developed SKYLIGHTS/GX, one of the first GUI prototyping and development tools for C and C++ programmers.  Gary led in the development of several state-of-the-art software products including interactive touch screen development tools, OCR and handwritten character recognition systems, and credit card fraud detection software.  He is the co-author (with Maria Litvin) of C++ for You++, the Java Methods series, Be Prepared for the AP Computer Science Exam in Java, and Mathematics for the Digital Age and Programming in Python.