Edward K. Muller (Author)
Edward K. Muller is professor emeritus of history at the University of Pittsburgh and former director of the university's Urban Studies Program. He focuses on the history and geography of North American cities, particularly Pittsburgh. He is coauthor of Making Industrial Pittsburgh: Environment, Landscape, Transportation, Energy, and Planning and Before Renaissance: Planning in Pittsburgh, 1889-1943, among other books, and editor of An Uncommon Passage: Traveling through History on the Great Allegheny Passage Trail and DeVoto's West: History, Conservation, and the Public Good, among other books.

Joel A. Tarr (Author)
Joel A. Tarr is the Caliguiri University Professor of History and Policy at Carnegie Mellon University where he has taught for over fifty years. He is the recipient of CMU's Robert Doherty Prize for "substantial and sustained contributions to excellence in education" (1992), the Leonardo da Vinci Medal of the Society of the History of Technology (2008), the American Environmental History Association Distinguished Service Award (2015), and the Founders Award, National Council on Public History (2018).