Juan-Andres Leon obtained his degree in history of science from Harvard University in 2013, while also working at Harvard’s Collection of Historical Scientific Instruments. His dissertation, “Citizens of the Chemical Complex: Industrial Expertise and Science Philanthropy in Imperial and Weimar Germany,” is a cultural and environmental history of the formation of Germany’s industrial elites. Leon is currently a postdoctoral fellow at the Beckman Center for the History of Chemistry and at the Museum of the Chemical Heritage Foundation in Philadelphia. His three ongoing research projects focus on the cultural transformations brought by automation, calculation, and simulation in the mid-twentieth century (CHF); the postwar construction of German astronomical observatories in countries under political dictatorships (Max Planck Institute for the History of Science); and the longue-durée relationship between water, industry, and topography.