Question as in the title:
Who was Hermann Künneth? Where can I find some biographical information beyond what is available on Wikipedia?
The well-known Künneth formula, for example in the form of exactness of the sequence $ 0 \to \bigoplus_{p+q = n} H_p(C) \otimes H_q(D) \to H_n(C \otimes D) \to \bigoplus_{p+q=n-1}\operatorname{Tor}_1(H_p(C),H_q(D)) \to 0, $ for complexes $C$ and $D$ of flat modules over a PID appears prominently in essentially every book on homological algebra and algebraic topology. Of course, Künneth formulated his insight in terms of Betti numbers, not in terms of homology groups.
Nevertheless, biographical information on its originator seems relatively hard to find.
Wikipedia links to Haupt's 5 page obituary in German which mainly focuses on Künneth's mathematics with only a few lines dedicated to his life.
Any further pointers would be appreciated.