Otto Jespersen died (30-4-1943)

If I may quote from my 2018 observance of his birthday:
July 16 - Otto Jespersen (1860)
I bought his "Growth and Structure of the English Language" (1905)
from the same guy who sold me Sapir's Language (1921), both great books
still in print decades after their first appearance. Late in life I acquired his seven-volume historical grammar of Modern English. But his interests ranged very widely; the titles "Language: Its Nature, Development and Origin" and "Mankind, Nation and Individual from a Linguistic Point of View" give some idea. Also an enthusiast for international auxiliary languages (Ido, Novial).
https://en.wikipedia.org/wiki/Otto_Jespersen
Crystal thinks Jespersen was the first linguist to publish a full autobiography (A Linguist's Life, 1938), and that it is a very good read. I think I have read it, and I think I agree. Trouble is, I sometimes get him confused with a near-contemporary Danish linguist, Holger Pedersen (1867-1953), perhaps most famous for coining the name "Nostratic".
https://en.wikipedia.org/wiki/Holger_Pedersen_(linguist)