On Saturday, 2 June 2018, Prof. Dr. Irenäus Eibl-Eibesfeldt died shortly before his 90th birthday in the circle of his family. As a student of Nobel Laureate Konrad Lorenz, he travelled at a young age with marine biologist Hans Hass to Galapagos to establish the first nature and species conservation programmes, with the help of UNESCO. Later he turned his research towards evolutionary biology of human perception, sensation, thought and behavior. He is the founder of the research branch Human Ethology and since 1970 head of his own research unit. At the end of the eighties he founded the Ludwig Boltzmann Institute for Urban Ethology in Vienna together with his student Dr. Karl Grammer. With his Human Ethology Film Archive and an impressive life's work on publications, Prof. Dr. Irenäus Eibl-Eibesfeldt holds the world's largest comparative cultural documentary archive about human behavior. An application for admission in UNESCO's Memory of the World Programme is in preparation. He has been honored by numerous prizes and awards.