Warren Buffet is without any doubt the greatest investor of all, and he happens to be of great humility and a great charity contributor, a rarity for someone that rich. He also happen to think that the extremely rich should be taxed for "using" society resources. A very progressive idea. He even converted evil Bill Gates to become more involved in charitable work with his immense fortune, and now Bill Gates is the biggest charity contributor. Another example showing that being an achiever is also compatible with being a progressive.
This is an interview he gave on the BBC about the recent crisis,
BBC NEWS | Business | Warren Buffett: Crisis, what crisis?