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Rosemarie Ostler, a linguist and former librarian, writes about the rich history of American usage and word invention. Her most recent book, Founding Grammars, explores the power of grammar rules and the centuries-long debate over how Americans should talk. Previous books showcase the colorful language of America's past, including obsolete twentieth-century slang, the origins of our most common expressions, and the country's long tradition of outrageous political invective. She is currently at work on a book about the beginnings of American English.

Rosemarie's articles cover a broad range of language-related topics, from the fate of endangered languages to plain English for business owners. Her byline has appeared in The Saturday Evening Post, Whole Earth, Christian Science Monitor, Entrepreneur.com, and Elks Magazine, among other places. She has taught workshops on research how-to and nonfiction book basics, and written about research, usage, and style for Writer's Digest and The Writer.

Rosemarie is a member of the American Society of Journalists and Authors. She lives in Eugene, Oregon with her husband, historian Jeff Ostler, and their cat, Calvin. She tweets at @Ostlerwords.