Since time immemorial, there has been one central question: What happens to us after death? Not only in philosophical contexts, but also on a practical level, researchers have arrived at astonishing results. Emil Mattiesen is one of the most important representatives of German parapsychology research. His three-volume main work "The Personal Survival of Death" has been regarded as a standard work in parapsychology since its publication from 1936 to 1939 and has not lost its significance to this day. Mattiesen approaches the question of life after death on an empirical basis: In his main work, he supports his theories with fascinating reports from séances, mediums, and eyewitnesses of parapsychological phenomena. His evidence for life after death has yet to be disproven. Mattiesen's studies are fundamental, and particularly the scope of his investigations is still recognized in the scientific community today.