Daniel N. Congreve is an assistant professor of electrical engineering at Stanford University; he is also cofounder of Quadratic 3D, a startup that is commercializing 3D printing technology. Congreve was previously a Rowland Fellow at the Rowland Institute at Harvard University. As a graduate student and postdoc at MIT, he studied solar cells and perovskite luminescence. When not in the lab, he’s chasing around his two children, both of whom currently list their favorite color of light as “all the colors.”