Hans von Seeckt (22 April 1866 - 27 December 1936) was a German military officer. Born in Schleswig, he entered the army in 1885 and was seconded to the General Staff in 1899. During World War I von Seeckt served in various high-level staff positions on the Eastern Front, including Chief of Staff to August von Mackensen while the latter commanded the Eleventh Army. Wikipedia
The definitive Wikipedia entry for Hans von Seeckt. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Hans_von_Seeckt