I have a PhD in the Philosophy of Religion from McGill University.  My comprehensive exams for my doctorate were on Nietzsche and Schopenhauer.  My dissertation examined their influence on the philosopher Albert Schweitzer.  My subsequent research continued this work by bringing all these philosophers into dialogue with Descartes, Hume, Kant, Hegel, Heidegger, Derrida, and Camus.  This research was then published in a title from McGill-Queens University Press, and in a follow-up book with Fortress Academic Press.  I have also taught several undergraduate and graduate courses in philosophy and ethics at university as well.  

Sources 

Brian Leiter and Michael Rosen.  2010.  The Oxford Handbook of Continental Philosophy.  Oxford University Press.

Étienne Gilson and Thomas Langan.  2021.  Modern Philosophy: From Descartes to Kant.  Random House.  

Forrest Baird.  2010.  Philosophic Classics, Volume III: Modern Philosophy.  Routledge.

Frederick Copleston.  2021.  A History of Philosophy: Volume IX: Modern Philosophy from the French Revolution to Sartre, Camus, and Levi-Strauss.  Image Books.