Online biography produced by the German Resistance Memorial Center. Also available are a vast selection of biographies of other members of the 'German resistance'. The physical museum and exhibition space in Berlin is a fantastic place to study and learn about this topic, although when I last visited, two-three years ago, much of the displays were in solely in German. Very much worth a visit, and the site of Stauffenberg's planning of the coup and execution by firing squad.
Link to biography (outside THF network).
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