Spencer, Erin: - Erin Spencer is a marine ecologist and National Geographic Explorer whose articles, photos, and videos of marine life have been featured in National Geographic, PBS, CBS Sunday Morning, and in publications of Ocean Conservancy. She is an avid public speaker and has presented to National Geographic, the World Bank, MCON, and TEDx, as well as many school groups. Originally from Maryland, she now lives in South Florida where she studies great hammerhead sharks and their prey for her PhD.