Sandyman, Jefferson: - Jefferson Sandyman Is an American application programmer and analyst, he was hired by a well-known company based in Chicago before achieving his master's degree in computer science at Stanford University. In the following years, Jefferson established his value by developing his own projects and competing with cutting-edge technology rivals. In August 2017 he met his wife Sandra Gollin, a passionate psychology teacher who transmitted to him the love for sharing and teaching. Was her who motivated Jeff to begin his first project: to put together all his data knowledge achieved in years of studies, researchers, and mistakes and convert it into easy language books accessible for everyone.