Dr James Curran, mostly known for his work at the Centers for Disease Control and Prevention (CDC) in the 1980's, pinpoints several key events and persons linked with the very first years of discoveries on HIV and AIDS.

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.