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Dr. Maass earned his Ph.D. from the University of Notre Dame, and before coming to ¹ÏÉñÍø taught at Notre Dame, Cornell University, and the University of Evansville. His first book, The Picky Eagle, was published by Cornell University Press in 2020. It explains why the United States expanded westward but chose to leave Canada, Mexico, Cuba, and other nearby areas independent, exploring how democracy and xenophobia limited U.S. territorial expansion. His second book, The United States and International Law, is an edited volume explaining why the United States supports international law in some ways while undermining it in others. He has also published research in journals such as the Texas National Security Review, Diplomatic History, International Studies Perspectives, International Security, Terrorism and Political Violence, and Historical Methods.