Michael DiSpezio is a renaissance educator who segued from the research laboratory of a Nobel Prize winner to the K–12 science classroom. He has authored and coauthored numerous textbooks and trade books. For nearly a decade he worked with the JASON Project under the auspices of the National Geographic Society, where he designed curriculum, wrote lessons, and hosted dozens of studio and location broadcasts. Over the past two decades, DiSpezio has developed material for PBS's Scientific American Frontiers, Discover Magazine^®, the Discovery Channel, and more. To all his projects, he brings his extensive background in science and his expertise in classroom teaching at the elementary, middle, and high school levels.

Mike Heithaus joined the Florida International University Biology Department in 2003, has served as Director of the Marine Sciences Program, and is now Director of the School of Environment and Society, which brings together the natural and social sciences and humanities to develop solutions to today's environmental challenges. His research efforts include the Shark Bay Ecosystem Project in Western Australia. He also served as a Research Fellow with National Geographic, using remote imaging in his research and hosting a Crittercam television series on the National Geographic Channel. His current research centers on predator-prey interactions among vertebrates.

An educator and linguist by training, a writer and poet by nature, Marjorie Frank has authored and designed instructional materials in all subject areas, including several HMH science programs. Her other credits include authoring science issues of an award-winning children's magazine; writing game-based digital assessments in math, reading, and language arts; and serving as instructional designer and coauthor of pioneering school-to-work software for a nonprofit organization dedicated to improving reading and math skills for learners in Grades 6–12. In addition, she has served on the adjunct faculty of Hunter, Manhattan, and Brooklyn Colleges, teaching courses in science methods, literacy, and writing.