For his scientific achievements research on amphibians in the field of neuroethology, Ewert was admitted as a fellow in the American Association for the Advancement of Science (AAAS).
In August 1981, Ewert, as director of the NATO Advanced Study Institute (NATO ASI), organized the International Conference of Advances in Vertebrate Neuroethology at the University of Kassel (Venue: Schlösschen Schönburg, Hofgeismar).