Norman Lewis (born December 30, 1912 in Brooklyn, New York – died September 8, 2006 in Whittier, California) was an author, grammarian, lexicographer, and etymologist. Lewis was a leading authority on English-language skills, whose best-selling 30 Days to a More Powerful Vocabulary published by Pocket Books in 1971 promised to teach readers "how to make words your slaves" in fifteen minutes a day.