I regard food as fuel. I am not a brunch person.

I realised how rich I had become and I asked myself, 'Do I really want to be the richest person in the cemetery?

I am involved in a lot of nonprofits. And when I reached the ripe old age of 60, I wanted to provide leadership to some I had been involved in.

My work life is intense. But I love what I do.

I give away about 50 percent of my income, so my, you know, desire to give back to the country is pretty strong and I intend to give away a lot more. I've signed the giving pledge with Warren Buffett and Bill Gates, and I intend to give away the bulk of my money.

I'm on a lot of nonprofit boards, but if I didn't enjoy it I wouldn't do it. I haven't yet done anything that's transformational in philanthropy. But I hope at some point to target two or three causes or organizations and really make transformational gifts.

My father worked in a post office and never made probably more than $8,000 a year as an employee of the post office, so when people can rise up from very modest circumstances and do well economically, I think that's a good thing about America, and we should encourage that kind of activity.