David E. Thomas is a scientist and software engineer best known for his scientific skepticism research and writings. He is a graduate of the New Mexico Institute of Mining and Technology, and his skeptic work covers the Roswell and Aztec UFO sightings, the Bible code, global warming, the 9/11 Truth movement and chemtrails. Thomas is frequently published in Skeptical Inquirer magazine.

CSICon or CSIConference is an annual skeptical conference typically held in the United States. CSICon is hosted by the Committee for Skeptical Inquiry (CSI), which is a program of the Center for Inquiry (CFI). CSI publishes the magazine Skeptical Inquirer.