[3] At the Ravensburg school, one of his teachers was Karl Bertsch, a leading Württemberg botanist, who stimulated his interest in botany and took him on private botanical excursions.
[3] In 1936, the family moved to Berlin, and Eichler started working at the Botanisches Museum Berlin-Dahlem (as a volunteer) under the tutelage of Friedrich Ludwig E Diels, at the same time having enrolled at the University of Berlin, to study botany and chemistry.
[1] After the war (1946–1949), he was able to continue his studies at the University of Halle-Wittenberg, and, in 1950, received his Doctorate in Natural Sciences for a thesis on floristic and phyto-oenological investigations into the Hakel.
[3] He married Marie-Louise Möhring in 1953, and went to Parma, and from there to the Nationaal Natuurhistorisch Museum Naturalis in Leiden, to work on Ranunculaceae.
[2] In addition to his contributions to botany in his roles at the State Herbarium of South Australia and later at the Australian National Herbarium, he contributed both nationally and internationally via service on many committees:[4] APNI gives some 91 published names.