Mark Allen is a copy editor, consultant and teacher with 30 years of professional experience working with words. After a career on newspaper copy desks, he became a freelance copy editor for individuals, universities, foundations, government and nongovernmental agencies, websites, and financial firms. He was reared on the AP Stylebook, and he has learned to use the Chicago Manual of Style, the Publications Manual of the APA, and numerous smaller style guides. His website is at markalleneditorial.com. On Twitter, he answers questions and posts editing tips as @EditorMark.