The physician and neuroanatomist Louis Jacobsohn-Lask (Fig. 1) was born on March 2, 1863, in Bromberg (then in the Prussian Province of Posen, today Bydgoszcz in Poland). His Jewish family moved to Berlin in the 1870s to escape antisemitism. He obtained his medical degree in 1888 from Friedrich Wilhelm University in Berlin and earned his doctorate in 1889 at the Second Medical Clinic of Charité Hospital. After a short period of private practice, he trained under the neuropsychiatrist Emanuel Mendel, founder of Neurologisches Centralblatt, and the anatomist Wilhelm von Waldeyer-Hartz. Thanks to Mendel, Jacobsohn had the opportunity to meet renowned physicians in Berlin, including the neurologist Edward Flatau, the ophthalmologist Bernhard Pollack, and the neuropathologist Siegfried Kalischer [1].