Andy Stern

In 1972, I signed a union card for SEIU. And for the last 38 years, 14 as president, it's been my life. I've seen the most miraculous, spectacular things. But there's a time to learn, a time to lead and a time to leave.

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.