Johann Heinrich Fixsen

Johann Heinrich Fixsen (19 October 1825 in St. Petersburg – 4 September 1899 in Hamburg) was a German entomologist who specialized in the Lepidoptera of the Palaearctic Region.

He wrote ''Lepidopteren-Verzeichniss der Umgegend von St. Petersburg'' (In Bull Moscou 22(1)) 1849 and many other scientific works describing new species. His collection is in the Biozentrum Grindel und Zoologisches Museum. Provided by Wikipedia