Leadership is about vision and responsibility, not power.

As many times as [HIV] changes its clothes, it's still wearing the same socks, and now our job is to make sure we get the body to really hate those socks.

Investments in immunization yield a rate of return on a par with educating our children - and higher than nearly any other development intervention.

Leadership is about vision and responsibility, not power.

The return on investment in global health is tremendous, and the biggest bang for the buck comes from vaccines. Vaccines are among the most successful and cost-effective health investments in history.

When it comes to providing aid, developing innovations and making bold steps that change the course of history, the United States is usually on the front lines.

The best vaccine imaginable is only valuable to the extent we get it to everyone who needs it.