Madelaine Francis Heleine has been involved with aquariums and fish-keeping for more than forty years. She has been a contributing writer and columnist for various magazines dealing with the aquatic world and has written several books about aquarium fish.

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David J. Helfand is the chair of the Department of Astronomy at Columbia University. He has also been a visiting scientist at the Danish Space Research Institute, the Sackler Distinguished Visiting Astronomer at Cambridge University, and president of the American Astronomical Society.

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Laurie Helgoe, PhD, is an author, educator, and clinical psychologist with a special interest in introversion and its relationship to mainstream culture. Dr. Helgoe is an assistant professor of psychology and chair of the Social Sciences Division at Davis & Elkins College in Elkins, West Virginia.

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Robert Hellenga is a professor emeritus at Knox College in Galesburg, Illinois, and the author of the novels The Confessions of Frances Godwin, Snakewoman of Little Egypt, The Sixteen Pleasures, The Fall of a Sparrow, Blues Lessons, Philosophy Made Simple, and The Italian Lover. He lives in Galesburg, Illinois.

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Erica Heller is the daughter of Joseph Heller, the author of Catch-22. An advertising copywriter, novelist, and creative consultant, her work has appeared in the New York Observer and on the Huffington Post. She lives in New York City at the ever-evolving Apthorp apartment building.

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Peter Heller is a seasoned adventure journalist and a senior contributor to Outside magazine.

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Laurence Heller, PhD, is the originator of the NeuroAffective Relational Model®, a unified approach to developmental, attachment, and shock trauma. He cofounded the Gestalt Institute of Denver and is a senior faculty member for the Somatic Experiencing Training Institute.

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Tania Heller is an MD and a Fellow of the American Academy of Pediatrics, educated in South Africa and trained at Georgetown. She has worked in a variety of types of medicine and has more than twenty years of experience as a doctor. She lives and practices in Bethesda, Maryland.

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Peter Hellman, a New York–based journalist and author, has been a contributor to Wine Spectator for more than a decade. His work has also appeared in the New York Times, the Wall Street Journal, New York magazine, and numerous other publications. His books include Chief! and When Courage Was Stronger than Fear.

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Chan Hellman is a professor and director of the Hope Research Center at the University of Oklahoma. He has written more than 150 scientific publications and has presented at numerous conferences worldwide. His research is focused on hope as a psychological strength helping children and adults overcome trauma and adversity.

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Eric Helm is the author of the Scorpion Squad Military Thrillers series and the Super Vietnam Ground Zero Thrillers series.

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Sarah Helm is the author of A Life in Secrets: Vera Atkins and the Missing Agents of WWII and the play Loyalty, about the 2003 Iraq War. She was a staff journalist on the Sunday Times (London) and a foreign correspondent on the Independent, and now writes for several publications. She lives in London.

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