
If you're interested, Shapiro's "Thinking about Mathematics: The Philosophy of Mathematics" gives a nice introduction into that topic, discussing several schools of philosophy and their thinkers (without forcing the authors pov on the reader). We had a seminar discussing that book, and while most philosophy students seemed happy to skip that seminar (too much math/logic), those of us with a MINT background (CS major here) found it quite amazing.
Aristotle, Nicomachean Ethics
David Chalmers, The Conscious Mind: In Search of a Fundamental Theory
Gottlob Frege, Die Grundlagen der Arithmetik
Thomas Hobbes, Leviathan
David Hume, An Enquiry Concerning Human Understanding
J.S. Mill, On Liberty
John Rawls, A Theory of Justice
Stewart Shapiro, Philosophy of Mathematics: Structure and Ontology