Joel A. Klein, the Molina Curator for the History of Medicine and Allied Sciences at The Huntington, explores the work of Daniel Sennert (1572–1637), professor of medicine at Wittenberg University, who sought to reform 17th-century medicine through alchemy, atomism, and experimentation. Sennert's reform led to clashes with traditionalists as well as profiteering charlatans, and ultimately resulted in charges of heresy and blasphemy. This lecture is sponsored by the Dock Society for the History of Medicine.