Croatian geologist, paleontologist, and archeologist Dragutin Gorjanović-Kramberger was born October 25, 1856.

His research on Homo primigenius helped establish its link as an ancestor of modern humans. Gorjanović-Kramberger’s work contributed to science’s understanding of the evolution of humans. 

 His views were also shaped by discussions he had with German anatomist Gustav Schwalbe at the 1903 meeting of the Gesellschaft Deutscher Naturforscher und Ärzte, held in Kassel, Germany. Schwalbe promoted the view that the Neanderthals, or Homo primigenius as he called them, were the ancestors of modern humans. As a result of these influences, Gorjanović-Kramberger identified the Krapina fossils as belonging to Homo primigenius (Neanderthal), and he also recognized that the stone implements discovered at Krapina resembled Mousterian implements found at other sites in Europe.
Dragutin Gorjanović-Kramberger (1856-1936) – Biographical Dictionary of the History of Paleoanthropology

Dragutin Gorjanović-Kramberger and Homo Neanderthalensis – Krapina
Part of the 100 Years of Discovery of Early Man from Krapina series
Issued by Croatia’s post office in 1999
Designer: Nikola Šiško

 

Dragutin Gorjanović-Kramberger (1856-1936) – Biographical Dictionary of the History of Paleoanthropology (in English) has an excellent, nicely detailed page on both Dragutin and his research. The Croatia 2 Go has a page that is interesting and not too complex page exploring the Krapina site and it’s rich historical significance The richest collection of Neanderthal man in the world. (In English)
For a deeper dive check out the Krapina museum  Krapina Neanderthal Museum (Has an English option). Don’t forget to check out their virtual tour.