As both developed and developing nations search for alternative sources of energy in response to the growing energy crisis, we at Acumen Fund believe that investing in entrepreneurs who provide innovative energy solutions is an increasingly critical part of the solution.

I think I still have a great sense of adventure and trust, and am surprisingly idealistic given all the horrible things I've seen since I was 25. I think how I have changed is that I have a much deeper understanding of the dark forces in the world, of power.

Even when early innovations start to succeed, it is not uncommon to see growing businesses sabotaged for threatening the status quo.

Impact investing has become a broad umbrella that includes all investing with a focus on both financial return and social impact, but in its best form, impact investing prioritizes impact over returns and achieves outcomes that traditional investing cannot.

Leadership is neither about you or me; it is about something that needs to be done. Leaders figure out how it can be made to happen and get ten or a million people to see that this is the way to do it.

As you get little pockets of success, then suddenly the light bulbs go on in everyone's head, and more leaders get more confident and make more, bigger decisions, and customers respond well, and it becomes a bit of a flywheel.

I never praised Mr. Snowden or said his actions rise to those of Mohandas Gandhi or other civil rights leaders.

In the city of Pyongyang, you don't have to look very far to see an image of the Great Leader, Kim Il Sung. They love the guy. He is responsible for the wonder that is North Korea.