Dr. Gregory Skomal is an accomplished marine biologist, underwater explorer, photographer, and author. As the principal investigator of the Massachusetts Shark Research Program, he has been studying and diving with sharks for almost 30 years. He has written numerous scientific research papers and has appeared in a number of film and television documentaries, including programs for National Geographic, Discovery Channel, and PBS. His most recent book, The Shark Handbook, explores the world of sharks.