He began his career with twelve years of classroom teaching, including a full year of graduate study, and then served for five years as the State Mathematics Supervisor for the Indiana Department of Education. As a result of all of his experience, he is convinced that everyone has the ability to understand mathematics. The company’s first major program, Algebra: A Complete Course, has, for twelve years, received enthusiastic response from reviewers and users, here in the United States, and in other countries as well. The company’s recently introduced program, Geometry: A Complete Course with Trigonometry is also receiving much acclaim.