Mark Allen is a copy editor, editorial consultant, and teacher with 25 years of professional experience working with words. After a career on newspaper copy desks, he became the first freelance copy editor elected to the board of the American Copy Editors Society. He has edited for individuals, universities, foundations, government and nongovernmental agencies, websites, and financial firms. He has spoken about copy editing for private companies and at conferences and workshops throughout the United States, and he teaches advanced copy editing online for UC San Diego Extension. He has written and presented for Copyediting and has also written for the American Copy Editors Society, Grammar Girl, and his own blog at markalleneditorial.com. On Twitter, he answers questions and posts editing tips as @EditorMark.