David Fajgenbaum is a physician, a healer, a speaker, a best-selling author, and the main reason he, himself is still alive today. After a devastating diagnosis of Castleman disease in 2010, David found himself on his deathbed a total of five times, told by doctors there was nothing more they could do. Determined not to sit and wait for death, David began to research his own disease, trying drugs designed for other purposes and ultimately finding one that saved his life.