Chris Murray, the renowned modeler, joined us to share his year-end reflections. In this year unlike any other, Covid-19 pushed modeling onto new ground, as forecasting of individual and governmental behavior became essential to inform decisions in the near to medium term. It’s been “a steep learning curve.” Looking ahead to 2021, in Q1 and 2 we will see a profound pivot, as vaccinations are scaled, winter ends, government policies evolve, and immunity within the population rises. We should arrive at “a surprisingly decent place in June or July.” As we “bounce back to pre-Covid behavior,” it will be a “balancing act.” Success in reaching herd immunity rests on a campaign to get “the maybes,” upwards of 30 percent of the population, while the 15-20 percent of “straight refusers” won’t budge. A vitally important “lingering question:” will we have attained enough vaccine coverage that nothing terrible happens in the winter of 2021-2022?   Chris Murray is the Director of the Institute for Health Metrics and Evaluation (IHME) at the University of Washington.