However, Hugo Eckener, who worked with Count Zeppelin, dismissed these claims: Cvi Rotem (1903–1980) wrote the only known biography, titled David Schwarz: Tragödie des Erfinders. Zur Geschichte des Luftschiffes. Rotem wrote that both Berg and Schwarz wished to keep their work secret. From 3 December 2000 to 20 April 2001 the Museen der Stadt Lüdenscheid held an exhibition which covered Berg, Schwarz and Zeppelin history from 1892 to 1932, with displays of documents, photographs and airship remnants. Notes References Bibliography Robinson, Douglas H., Giants in the Sky. Henley-on Thames: Foulis, 1973 Schnitzler, Norbert. 2000. WWW-Tipp der Woche 24/2000 (German summary of museum exhibition) (also 1996 Gutenberg version) External links Library of Congress Linked Authority File for David Schwarz Schwarz's Airship 1850 births 1897 deaths Engineers from Zagreb Croatian Austro-Hungarians Croatian people of Hungarian-Jewish descent Aviation inventors Airship designers Aviation history of Germany Croatian balloonists Hungarian inventors Hungarian Jews Hungarian engineers 19th-century aviation 1890s in Germany 19th-century German aviation Airships