Emil Karl Gustav Alfred Mattiesen (23 January 1875[1] – 25 September 1939) was a Baltic Germans musician, music pedagogue, composer and philosopher.

[2] He had to interrupt his studies due to illness in the fall of 1894, and continued in 1895, first again in Dorpat, and from October 1895 again in Leipzig, where he received a PhD in 1896,[3] writing about the philosophical critique in the work of John Locke and George Berkeley.

[3] His compositions were published by Henri Hinrichsen, on a recommendation by Hugo Wolf,[4] including 17 Liederhefte (song collections).

[6] A review in the journal Die Musik from February 1914 reports a recital in which she premiered five songs and mentions the composer's talent for humorous topics, such as "Jedem das seine" after a poem by Eduard Mörike.

His two main books in the field, Der jenseitige Mensch (published in 1925) and Das persönliche Überleben des Todes: eine Darstellung der Erfahrungsbeweise (The Personal Survival of Death: An Account of the Empirical Evidence) in three volumes (1936–1939), became standard works in German.

[2] In his magnum opus Das persönliche Überleben des Todes, he advocated the survival hypothesis, listing several phenomena which seem to prove empirically that the soul lives on after death.