Ion Mihailescu is a Ph.D. candidate in the Department of the History of Science at Harvard University. His dissertation explores the development of graphical methods and diagrammatic representations in the physical sciences in the 19th century. Ion has received a B.A. in History, Mathematics and Physics from Columbia University in 2010. Since 2013 he has been a Content Developer for the EMC2x course, and is the Head Teaching Fellow for The Einstein Revolution in Spring 2015.