1939 suicides

Guido da Verona (the pseudonym of Guido Verona; 7 May 1881 – 5 April 1939) was an Italian poet and novelist.
Born in Saliceto Panaro to a Jewish family, Verona started his career as a poet in 1901 with the poetry collection Commemorazione del fatto d'arme di Brichetto, followed by I frammenti d'un poema (1902) and Bianco amore (1907).He gained a larger popularity as a novelist, starting from 1911 when he published his first novel Colei che non si deve amare, considered among the most representative examples of the Italian Feuilleton. He later was the most commercially successful Italian writer between 1914 and 1939: particularly his novel Mimì Bluette, fiore del mio giardino, which reached 300,000 copies in 1922, an impressive run in Italy where illiteracy characterized the majority of the population.He was a signatory to the Manifesto of Fascist intellectuals in 1925; in 1929 he published a parody novel of Alessandro Manzoni's The Betrothed, that actually was an implicit satire against fascism.He became an intellectual unpopular with the Fascist regime and marginalized after the approval of racial laws. Da Verona committed suicide in Milan at age 57.

Jakob Weiseborn (22 March 1892 in Frankfurt – 20 January 1939 in Flossenbürg) was a German SS-Sturmbannführer (major) and the first commandant of Flossenbürg concentration camp.

Paul Epstein (July 24, 1871 – August 11, 1939) was a German mathematician. He was known for his contributions to number theory, in particular the Epstein zeta function.
Epstein was born and brought up in Frankfurt, where his father was a professor. He received his PhD in 1895 from the University of Strasbourg. From 1895 to 1918 he was a Privatdozent at the University in Strasbourg, which at that time was part of the German Empire. At the end of World War I the city of Strasbourg reverted to France, and Epstein, being German, had to return to Frankfurt.
Epstein was appointed to a non-tenured post at the university and he lectured in Frankfurt from 1919. Later he was appointed professor at Frankfurt. However, after the Nazis came to power in Germany he lost his university position. Because of his age (68) he was unable to find a new position abroad, and finally committed suicide by barbital overdose at Dornbusch, fearing Gestapo torture because he was a Jew.

Ludwig Anton Salomon Fulda (July 7, 1862 – March 7, 1939) was a German playwright and poet, with a strong social commitment. He lived with Moritz Moszkowski's first wife Henriette, née Chaminade, younger sister of pianist and composer Cécile Chaminade.

Stanisław Ignacy Witkiewicz (Polish: [staˈɲiswaf iɡˈnatsɨ vʲitˈkʲɛvʲitʂ]; 24 February 1885 – 18 September 1939), commonly known as Witkacy, was a Polish writer, painter, philosopher, theorist, playwright, novelist, and photographer active before World War I and during the interwar period.

Buell Halvor Quain (May 31, 1912 – August 2, 1939) was an American ethnologist who, after graduating from University of Wisconsin–Madison and studying as a graduate student at Columbia University, worked with native peoples in Fiji and Brazil. He published a total of four books, three of them posthumously.
In 1938, Quain travelled to Brazil to work with the Kraho people of the Brazilian rainforest, where he also spent time in the Trumai village.