[2] After his participation in the First World War, reaching the rank of lieutenant, Zipperer began studying jurisprudence at Ludwig Maximilian University of Munich, under, among others, Konrad Beyerle.
With a dissertation on the Haberfeldtreiben[3] with Eugen Wohlhaupter, he received his doctorate of law in 1937 at the University of Kiel.
Zipperer and Heinrich Himmler were best friends as children in Munich, and they remained very close throughout their lives.
[5] When Zipperer returned home from service in the First World War, the two were again classmates, and they spent a great deal of time writing poems, an interest that bound them together.
[6] Himmler once remarked that Zipperer was "a really nice, good friend and a great man of genius".