Klaus Dona, of Vienna, Austria
, is one of the world's leading experts on Out of Place Artifacts, unique ancient remnants from long-departed people and civilizations that appear to connect us with advanced visitors from the cosmos and beyond. His work also contributes to the Ultraterrestrial Hypothesis. Dona is the author of Klaus Dona Chronicles: Secret World I.
- Klaus Dona: Digging for Answers...and Finding More Questions (2011), by Laurel Steinhice