On a completely side note, is it discussed and well-known in Chabad circles that he was in University in Berlin, wore the Litvishe type hat, etc? When I read it, I was very pleasantly surprised. I have no doubt that its one of the reasons he was more approachable and open than other manhigai hador.
"Schneerson studied mathematics, physics and philosophy in Berlin, Germany for five semesters from mid-1928 through 1930.[24] His father-in-law, Yosef Yitzchok, paid for all the tuition expenses and helped facilitate his studies throughout."
"In 1933, Rabbi Schneerson moved to Paris, France. He studied mechanics and electrical engineering at the École spéciale des travaux publics, du bâtiment et de l'industrie (ESTP), a Grandes écoles in the Montparnasse district. He graduated in July 1937 and received a license to practice as an electrical engineer. In November 1937, he enrolled at the Sorbonne, where he studied mathematics until World War II broke out in 1939."