system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Where are all the modern philosophers? We still reference Socrates and Aristotle because?
gpt
> Where are all the modern philosophers

At universities, mostly. 

You may not have heard of them for several reasons. 

Name recognition is like a ripple on a pond: it starts out small within its own circle and gradually becomes larger as it spreads to a wider and wider audience. Unless you're a philosopher, the ripple may not have reached you yet.

Another reason is that philosophy is like a series of memes. Socrates started the meme, Plato modified it, Aristotle commented on Plato, and so on. Finally, after hundreds of years, the memes are so meta that they're hard to "get" without starting from the beginning. Contemporary philosophy tends to be very meta because it's building on hundreds or thousands of years of discussion. This can sometimes make contemporary philosophy seem harder or less interesting (which in turn makes it harder to reach a wide audience).

Also, in Socrates' time, most subjects were considered philosophy. Math, logic, biology, physics, psychology, linguistics (the study of language), rhetoric (public speaking), and politics were all part of philosophy. Eventually, these subjects became big enough that they split off from philosophy and formed their own subject. Whenever this happened, philosophy's piece of the pie got a little bit smaller. This meant that philosophers were making fewer discoveries and other subjects were making more. If these subjects hadn't split off, incredibly famous people like Einstein, Chomsky, and Hawking would be philosophers.

Here's an (incomplete) list of influential "modern" philosophers:

Kripke, Peter Singer, Rawls, Nozick, Derrida, Foucault, Habermaus, Daniel Dennett, Chalmers, Hilary Putnam, Timothy Williamson, Alvin Plantinga, Karl Popper, Thomas Kuhn. 

Go back a little farther and you have Bertrand Russell, Wittgenstein, Heidegger, Sartre, and Camus.