Look no further than George Mason University. It used to be an also-ran commuter college, now with a steady stream of income from the Koch family it's actually fairly respectable. You have to watch what you say, though, when you are on the faculty.
Epstein's influence was fairly confined, but the Koch sponsorship of unfettered capitalism and global warming denial continues to affect the planet. They are ultimately the greater evil.
The Kochs also recently funded with Soros a think tank in washington dc to help promote the idea of peace and stop the endless wars the US is involved in.
As far as I know David Koch didn't deny global warming, but strongly disagreed with the conventional ideas of how to combat it and the risks that it poses. There are many people who think that there are better ways to address it. For instance, addressing 3rd world poverty and increases the wealth of the world will increase the rate of climate change, but it will also benefit those suffering substantially and enable thier children (who are richer) to better handle it. I don't necessarily endorse or agree with his views, but I feel they're often mistated for political reasons.