When the U.S. was hit by the Covid 19 pandemic, President Trump often praised unproven treatments. While trying not to contradict Donald Trump, Dr. Anthony Fauci, one of the top infectious disease experts in the country, became a calming presence, advocating practical remedies like social distancing. He also became the target of right-wing conspiracy theorists who sent him death threats. I talk to Dr. Fauci about his role in developing treatments for once-fatal diseases like AIDS and how his life changed in the challenging years of the Trump administration. “Now What?” is produced with the help of Steve Zimmer, Andreea Coscai and James Napoli. Audio production is by Nick Ciavatta.