President Trump's daily briefings on the COVID-19 pandemic have introduced millions of Americans to Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases.
Evan Vucci/AP Photo
Dr. Mathilde Krim at the World AIDS Day Symposium presented by the Foundation For AIDS Research and the Columbia University Mailman School of Public Health in 2002. Krim had a knack for helping people talk about HIV/AIDS rationally, colleagues say.
Health care workers in South Africa speak to residents during a door-to-door AIDS awareness campaign, part of a series of prevention efforts that has helped lower the country's HIV infection rate.
Mujahid Safodien/Reuters /Landov