Richard Siegert is the author of The Tiger from Poznan.

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Wolfram Siemann, one of Germany's leading historians of the nineteenth century, is Professor Emeritus for Modern and Contemporary History at the Ludwig Maximilian University of Munich.

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Javier Sierra, whose works have been translated into thirty-five languages, is the author of The Lost Angel, The Lady in Blue, and the New York Times bestselling novel The Secret Supper. A native of Teruel, Spain, he currently lives in Málaga.

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Wallace Sife, PhD, is a psychologist and internationally renowned authority on pet bereavement, and a pioneer in this field. The first edition of The Loss of a Pet won the prestigious Maxwell Award for the best nonfiction pet book of 1993.

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Nicolaj Siggelkow is the David M. Knott Professor at the Wharton School, University of Pennsylvania, where he also serves as codirector of the Mack Institute for Innovation Management. He has won more than thirty teaching awards and leads many executive education programs on strategy at Wharton.

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Richard Sigmund (1941–2010) was a minister and speaker who was known for his experiences in heaven and hell after dying in a car accident in 1974. He has preached the gospel on television programs, radio broadcasts, and speaking engagements. He and his wife, Priscilla, are the founders of Cleft of the Rock Ministries in Iowa.

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Karl Sigmund is a professor of mathematics at the University of Vienna. One of the pioneers of evolutionary game theory, he lives in Vienna.

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Michael Signer is an author, advocate, political theorist, and attorney. He has taught political theory, leadership, and governance at the University of Virginia, Virginia Tech, and the University of California. Michael is the author of Demagogue: The Fight to Save Democracy from Its Worst Enemies. He lives with his wife and twin boys in Virginia.

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Michelangelo Signorile is the host of the SiriusXM radio show The Michelangelo Signorile Show and the bestselling author of Queer in America. An award-winning journalist, Michelangelo has written for dozens of publications, including the New York Times, USA Today, New York magazine, and the Village Voice.

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Yrsa Sigurdardóttir is an Icelandic writer of crime fiction, including the Thóra Gudmundsdóttir series. Yrsa has also written for children, and won the 2003 Icelandic Children's Book Prize with Biobörn.

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In 2017, David Sikorjak founded Dexterity Consulting, a strategy and analytics consultancy that artfully blends research, analysis, and empathy to transform how brands think. Prior to that, he was an executive at Publicis, NBC, and Madison Square Garden.

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Ed Sikov has taught at Haverford College, Colorado College, and Columbia University. He is the author of seven books, including Laughing Hysterically: American Screen Comedy of the 1950s.

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