Preschool Science: Exploring Creation Together is written by Rachael Yunis. Rachael is the coauthor of Apologia’s Advanced Biology textbook, author of Apologia’s Young Explorer Earth Science textbook, and the science and math director at Apologia. She holds a Bachelor of Science degree in Biology, a Master of Science degree in Molecular Genetics, and a Master of Arts degree in Biomedical Ethics. This title was written with her husband and technical editor, Sam Yunis, PhD. Dr. Yunis is employed at NASA. Together they homeschooled their boys through high school. Their children have degrees in the sciences and work in the aerospace and computer science industries.