Johnna Rizzo is a former staff writer at National Geographic magazine and an editor at National Geographic Books and the Smithsonian's Freer and Sackler galleries. She is a frequent contributor to National Geographic Kids, and has written for Scientific American, Newsweek, and The Washington Post. Rizzo is the author of Ocean Animals: Who's Who in the Deep Blue. Sylvia A. Earle is a marine biologist, author, lecturer, and ocean explorer. She has been a National Geographic Society Explorer-in-Residence since 1998. Called "Her Deepness" by The New York Times, Earle has a BS from Florida State University and a PhD from Duke University, as well as numerous honorary doctorates. When not underwater, she lives in Oakland, California.