Detlef Mertins (1954–2011) made lasting contributions to the theory and history of modernism in architecture, art, philosophy, and urbanism. From 2002 to 2007, he was Professor of Architecture and Chair of the Department of Architecture at the University of Pennsylvania. He also taught at the University of Toronto and, as a visiting professor, at Columbia University, Harvard University, Princeton University and Rice University. Among his many published books are Modernity Unbound (2011); G: An Avant-Garde Journal of Art, Architecture, Design, and Film, 1923–1926 (2010), co-edited with Michael Jennings; The Presence of Mies (1994) and Metropolitan Mutations: The Architecture of Emerging Public Spaces (1989). Mertins also published numerous essays in scholarly journals and anthologies, as well as critical writings on contemporary architecture.