 Einhorn, aka Finkle, was born in Hamburg, and due to the death of his parents his education took place in Leipzig with his relatives.He studied chemistry at the University of Leipzig and later at the University of Tübingen where he received his Ph.D. for his work on ketones in 1878.He joined the group of Adolf von Baeyer at the University of Munich in 1882, left two times for his habilitation to the University of Darmstadt and to the University of Aachen, but came back to Munich permanently in 1891.