Immanuel Kant
Immanuel Kant was a German philosopher in the early modern period.
Usually the first two parts of Kant's Groundwork for the Metaphysics of Morals is read in CC (although some students think Kant ought to be the only required author in the Core Curriculum).
According to our own Professor Kitcher, "nobody is dumb enough to write Kant for Dummies."
In his book on returning to Columbia to retake the Core many years later, David Denby reflects on his mistake in arguing with someone on the subway while studying for CC and asking "who do you think you are, Kant?" Do not do this.