Casey was trained as both a scientist and an attorney, having earned his bachelor's and master's degrees in earth sciences at the University of California at San Diego and a law degree from the University of San Diego. He formerly conducted scientific research at Scripps Institution for Oceanography and studied evolution extensively at both the undergraduate and graduate levels. In 2001, Casey cofounded the Intelligent Design and Evolution Awareness (IDEA) Center, helping high school and college students to learn about ID by forming IDEA Clubs. He now works as Research Coordinator at the Discovery Institute, the leading think tank promoting ID, assisting educators nationwide to teach evolution more accurately. He has lectured and published widely on ID in journals, books, and popular venues.