Alfonso Martines Arias is ICREA Research Professor in the department of systems bioengineering of the Universitat Pompeu Fabra in Barcelona. The recipient of numerous awards, he is coauthor of the biology textbook Principles of Development, which was awarded the Royal Society of Biology book prize.

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Cindy N. Ariel, PhD, is a psychologist in Philadelphia, Pennsylvania, with over twenty years of experience working with people dealing with Asperger's syndrome. She is coeditor of Voices from the Spectrum.

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David Aries is the author of the Half-Breed Hunter series and The Fractured World.

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Anthony Arillotta is the former boss of the Springfield, Massachusetts, faction of New York City's Genovese crime family.

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Aristotle (384–322 BC) was a Greek philosopher whose best-known works include Metaphysics, Nicomachean Ethics, and Politics.

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Febe Armanios is Associate Professor of History at Middlebury College and the author of Coptic Christianity in Ottoman Egypt.

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John Armbruster has taught American history and government at the middle and high school level for twenty-nine years. Before becoming a teacher, he wrote for public radio and newspapers after graduating from the University of Wisconsin-Madison. He lives on a small farm outside of Viroqua, Wisconsin.

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Jennifer L. Armentrout is the New York Times and USA Today bestselling author of the Covenant series and the Lux series. She writes young adult paranormal, science fiction, fantasy, and contemporary romance, and she also publishes adult romantic fiction, including the Gamble Brothers series, under the pseudonym J. Lynn.

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Fr. Charles Arminjon (1824-1885) was a priest from the town of Chambéry in the French Alps. After years as a seminary professor, Father Arminjon took up the mission of full-time preacher, and he went on to gain great renown for his ability to inspire in his listeners a deeper and more ardent love for Christ.

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J. A. Armitage has traveled the world, has climbed to the top of Mount Kilimanjaro and the bottom of the Grand Canyon, and once gave birth to a surrogate baby for a friend of hers. She is coauthor, with J. A. Culican, of the Dragon Tamer series.

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Vernice "FlyGirl" Armour is a former captain in the U.S. Marine Corps, where she served as the first African American female combat pilot, and a successful motivational speaker whose media appearances include The Oprah Winfrey Show.

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Jennifer Keishin Armstrong is the author of Mary and Lou and Rhoda and Ted, a history of The Mary Tyler Moore Show. She writes about pop culture for several publications, including the New York Times Book Review, Fast Company, and Entertainment Weekly. She grew up in Homer Glen, Illinois, and now lives in New York City.

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