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Karl Jasper's role in developing existentialism is noted well in "At the Existentialist Café" by Sarah Bakewell[0].

He's also known as the mentor of Hannah Arendt, who later wrote "Origins of Totalitarianism", "The Human Condition" (Alan Kay's favorite book[1]) and "Eichmann in Jerusalem" (served as basis of her 2012 biopic[2])

[0] https://www.amazon.com/dp/1590514882

[1] http://www.squeakland.org/resources/books/readingList.jsp

[2] https://www.imdb.com/title/tt1674773/

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