Alfred Eisenack (born 13 May 1891 in Altfelde, West Prussia, died 19 April 1982 in Reutlingen) was a German paleontologist.
Eisenack took his photographs using a Leitz monocular microscope, to which he attached a box camera fashioned from a biscuit tin and furnished with glass negatives.
He then studied geology with Karl Erich Andrée in Königsberg, and subsequently took a qualifying exam as a teacher.
After returning from Siberia in 1951, he became visiting professor at the University of Tübingen,[2] after he had become a full-time teacher at the Oberreutlinger trade school in Reutlingen.
Two of his students were Hans Gocht and Gerhard Alberti - refugees from the Communist regime of East Germany; another was Karl W.
Eisenack also described assemblages from the Oligocene amber-bearing sediments of East Prussia, now Kaliningrad, Russia,[12] and he reported what he considered to be "hystrichospheres" from German Silurian deposits.
[13][14] Eisenack long resisted the use of the term Acritarch, proclaiming "die Einheitlichkeit der Hystrichospharen" - the unity of the hystrichospheres (1963a, b).