Hannah Arendt (1906–1975) was an influential German political theorist and philosopher whose works include The Origins of Totalitarianism, The Human Condition, and Eichmann in Jerusalem.

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Dale Arenson fell into the dangerous life of a 1% outlaw biker in Southern California, with numerous run-ins with the law. After years of hard work, becoming an airline pilot and a world champion competition rifle shooter, the author of Hangmen has lived an exciting life, and is anxious to share his experiences.

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Daniel Arenson is a USA Today bestselling author of fantasy and science fiction. His novels have sold over a million copies. The Huffington Post has called his writing "full of soul."

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John "Alexander" Arezzi is an entrepreneur who lives in Long Island and Nashville. He runs matmemories.com and the Pro Wrestling Spotlight Then & Now podcast.

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Laura M. Argys is professor of economics at University of Colorado Denver. She is coeditor, along with Susan Averett and Saul Hoffman, of The Oxford Handbook of Women and the Economy.

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J. J. Arias is an independent author of lesbian romantic fiction. Her books include Guava Flavored Lies, the Goode Girl Lesbian Romance series, and the Dusk Queen series.

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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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Nir Arielli is professor of international history at the University of Leeds. He is the author of From Byron to bin Laden: A History of Foreign War Volunteers and Fascist Italy and the Middle East. He has also written contemporary political commentary for the Globe Post, Haaretz, and the Conversation.

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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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