Dr. Paul Pimsleur devoted his life to language teaching and testing and was one of the world's leading experts in applied linguistics. After years of experience and research, Dr. Pimsleur developed The Pimsleur Method based on two key principles: the Principle of Anticipation and a scientific principle of memory training that he called "Graduated Interval Recall." This Method has been applied to the many levels and languages of the Pimsleur Programs.