Frances Gies (1915–2013) was a historian who wrote or cowrote many books on the Middle Ages, including The Knight in History; Cathedral, Forge, and Waterwheel; and Daily Life in Medieval Times.

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Joseph Gies (1916–2006) was a bestselling historian of medieval Europe. He collaborated with his wife, Frances Gies, on a number of books, in addition to writing separate titles.

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Erica Gies is an award-winning independent journalist and National Geographic Explorer who writes about water, climate change, plants, and animals for Scientific American, the New York Times, Nature, the Atlantic, and other outlets. She cofounded two environmental news startups, Climate Confidential and This Week in Earth.

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Andy Giesler has been a library page, dairy science programmer, teacher, technical writer, and healthcare software developer. He's a husband, father, and nonprofit web consultant living in Madison, Wisconsin. The Nothing Within is his first published novel.

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Barbara S. Giesser, MD, is professor of clinical neurology in the David Geffen School of Medicine at UCLA and the clinical director of the MS program at UCLA. She has been specializing in multiple sclerosis patient care since 1982 and is internationally recognized for her clinical expertise.

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Steven P. Gietschier is an archival consultant for The Sporting News. He taught American history, sport history, and the history and culture of baseball at a midwestern university before retiring in 2020, and prior to that he served in several roles for The Sporting News.

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Born and raised in Washington, D.C., Andrew Gifford is the founder and director of the Santa Fe Writers Project, an indie press dedicated to craft writing. He is the grandson of the founder of Gifford's Ice Cream.

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Danielle Giffort is assistant professor of medical sociology at the St. Louis College of Pharmacy.

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Gerd Gigerenzer is Director Emeritus at the Max Planck Institute for Human Development and the author of Calculated Risks, Gut Feelings, and Risk Savvy and the coeditor of Better Doctors, Better Patients, Better Decisions, and Classification in the Wild.

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Carol Gigliotti is professor emerita of dynamic media and critical and cultural studies at Emily Carr University of Art and Design. She is the editor of Leonardo's Choice: Genetic Technologies and Animals.

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Matthew P. Gilbert, in addition to being a fiction author, is a professional video game developer, a veteran, a columnist for his local newspaper, and the father of three wild boys and two wild girls. He was born and raised in Woodbury, Georgia, and has been on watch for zombies ever since.

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Brad Gilbert, a former professional tennis player, has coached tennis stars Andre Agassi, Andy Roddick, Andy Murray, and Kei Nishikori. He is also coauthor of I've Got Your Back: Coaching Top Performers from Center Court to the Corner Office.

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