Mary Ellen Guffey is emeritus professor of business from Los Angeles Pierce College. She has taught business communication and business English topics for over thirty years. She received a bachelor's degree, summa cum laude, in business education from Bowling Green State University; a master's degree in business education from the University of Illinois, where she held a fellowship; and a doctorate in business and economic education from the University of California, Los Angeles (UCLA). She has taught at the University of Illinois, Santa Monica College, and Los Angeles Pierce College. She is the author of Business Communication: Process and Product, a leading textbook in the field. She has also written Business English, which serves more students than any other book in its field; Essentials of College English, and Essentials of Business Communication, the leading text/workbook in its market. Dr. Guffey serves on the review boards of The Delta Pi Epsilon Journal and Business Communication Quarterly of the Association of Business Communication. A teacher's teacher and leader in the field, Dr. Guffey acts as a partner and mentor to hundreds of business communication instructors across the country. Her workshops, seminars, newsletters, articles, teaching materials, and Web sites help novice and veteran business communication instructors achieve effective results in their courses. She privately maintains comprehensive Web sites for students and instructors. Her print and online newsletters are used by thousands of instructors in this country and abroad.Mary Ellen Guffey is the author of 'Essentials of Business Communication (Available Titles CengageNOW)', published 2006 under ISBN 9780324313925 and ISBN 0324313926.