Alvin E. Roth

The simple model of a bridge is great, and you could not build a bridge without understanding it well. But if you're actually building the bridge, you need to know the site. A lot of economics is like that: When prices go up, demand is gonna go down. You can't forget that and run your economy. But it's not the only thing you need to know.

In 1967, the world health community launched a global effort to eradicate smallpox. It took a coordinated, worldwide effort, required the commitment of every government, and cost $130 million dollars. By 1977, smallpox had disappeared.

I enjoy collaborating with creative people and trying to get the best image possible to convey a feeling or story. Plus, I get flown all over the world to exotic places. How can you lose interest in that? It's a great lifestyle. I can take vacations whenever I want, and no two shoots are ever the same.