Martin Kulldorff was born in 1962 in Lund, Sweden. He received his Ph.D. from Cornell University and is a professor of medicine at Harvard Medical School and a biostatistician at the Brigham and Women's Hospital. He serves on scientific advisory committees to the Food and Drug Administration and the Centers for Disease Control.  In this podcast, we talk about the efficacy of the vaccine, the concept of herd immunity, the efficacy of natural immunity, the Great Barrington Declaration, who’s at risk of dying from Covid, and many other things related to the pandemic.