In 1981, I was a surgeon in training at Massachusetts General Hospital in Boston. I still remember the day we learned about a strange, new, deadly infection that presented on the West Coast.

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The HIV/AIDS pandemic was ten years old in 1991 when I joined the University of California at San Francisco as a young medical resident. It was a humbling time to begin practicing medicine; almost all of our AIDS patients died within two years of diagnosis.

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People often ask me what’s different about working at the Gates Foundation. I always say that it’s nice to have a boss who is even more impatient than I am about stopping the spread of HIV.

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In 1993 Melinda and I took our first trip to Africa. I was working with Microsoft at the time and I was convinced that the power of technology could change the world.

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Today is World AIDS Day, an important reminder that despite tremendous progress, there is still much to be done to prevent and treat HIV infection.

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