Dr. Horst-Joachim Lüdecke is a physicist and professor emeritus of computer science, physics and operations research at the University of Applied Sciences of the Saarland. He is now retired. Before his position at Saarland, Lüdecke worked for the chemical industry creating numerical computer models for chemical facilities and for flow processes in pipelines and supply pipe networks. His doctoral research was in nuclear physics.

He is listed as an “Advisory Board” member of the German skeptic organization EIKE and is also mentioned as their “Press Spokesman” or Press secretary for science and technology. He has written the book CO2 and climate change (Bouvier-Verlag) which suggests that climate change is a natural occurrence independent of man-made CO2.