Closing session of the XIX International AIDS Conference with speakers such as Bill Clinton, the two co-chairs of the conference Elly Katabira and Diane Havlir, US politician Nancy Pelosi, Françoise Barré-Sinoussi, and many activists and community leaders.

XVI International AIDS Conference in Toronto. Session on global health policy with Bill Gates and Bill Clinton.

Helene Gayle is an AIDS expert who has been working in many different initiatives in the US, among them the Centers for Disease Control (CDC). She also works in President Obama's advisory group on HIV/AIDS. Here she talks about understanding and changing behaviors.