Ludwig Josef Johann Wittgenstein (* 26. April 1889 in Wien; † 29. April 1951 in Cambridge) Philosophie der Logik, der Sprache und des Bewusstseins > Logischer Positivismus und Analytische Sprachphilosophie. Nach der mündlichen Doktorprüfung soll Wittgenstein seinen Prüfern auf die Schulter geklopft haben mit den Worten: Don't worry, I know you'll never understand it.
Ludwig Wittgenstein: In Russia and Norway etc. Photo by Gilbert Pattison during the trip to France, July 1936
“Whereof one cannot speak, thereof one must be silent.” ― Ludwig Wittgenstein
Ludwig Wittgenstein im Fellows Garden, Trinity College. Aufnahme von Norman Malcom
Wittgenstein and Von Wright
Ludwig Wittgenstein: Portrait on receipt of his primary school teaching qualification, 1919, after his release from an Italian POW camp at the end of WWI. He'd enlisted in Austria according to his sister: "As I well know, he was not only concerned to defend his country; he had an intense desire to take on something difficult and demanding and to do something other than purely intellectual work."
Wittgenstein on his deathbed, Cambridge, April 1951.