Betty Schrampfer Azar is the author of the Azar Grammar Series for students of English as a second or foreign language. A staple in English language teaching for more than three decades, the series is widely used throughout the globe. Azar is a proponent of Grammar-Based Teaching in which grammar serves as the starting point and foundation for the development of all language skills — speaking, listening, writing, and reading. The series is entering its fifth edition. With the addition of co-author Stacy A. Hagen in 2006, the series is now known as the Azar-Hagen Grammar Series.There are three principal textbooks in the series: Understanding and Using English Grammar, Fundamentals of English Grammar and Basic English Grammar. Bio from Wikipedia, the free encyclopedia.