Kieran Mulvaney is the author of At the Ends of the Earth: A History of the Polar Regions, and The Great White Bear: A Natural & Unnatural History of the Polar Bear. He has also covered boxing for ESPN, Reuters, Showtime and HBO.

Kelli Y. Nakamura is an associate professor of history at Kapi’olani Community College in Honolulu, Hawaii.

Eric Niiler is a science/climate reporter at The Wall Street Journal. His work has also appeared in WIRED, National Geographic, The Washington Post and others.

Nadra Nittle is a veteran journalist who is currently the education reporter for The 19th. Her writing has appeared in The Guardian, NBC News, The Atlantic, Business Insider and other outlets. She is the author of bell hooks' Spiritual Vision and other books.

Edward T. O’Donnell is Associate Professor of History at the College of the Holy Cross. Author of several books, including Henry George and the Crisis of Inequality: Progress and Poverty in the Gilded Age, O’Donnell also the hosts the popular American-history podcast In The Past Lane. Follow him on Twitter @InThePastLane.

Amanda Onion is a senior editor at HISTORY.com. She has worked as an editor and writer for multiple publications, including Newsweek, ABC News, Discovery News.

Tim Ott has written for HISTORY.com and other A+E sites since 2012. He has also contributed to sites including MLB.com and Optimism, and teaches writing in his adopted hometown of Fort Lee, New Jersey.

Daina Ramey Berry is the Michael Douglas Dean of Humanities and Fine Arts at the University of California, Santa Barbara. She is a scholar of the enslaved and the award-winning author/editor of books on slavery including The Price for Their Pound of Flesh, the Value of the Enslaved, from Womb to Grave, in the Building of a Nation. Follow her on twitter @DainaRameyBerry. Nakia D. Parker is an assistant professor of history at the Michigan State University. Her research is on the history of gender, slavery and migration in the Choctaw and Chickasaw Nations.