Phillip B. Wagoner's research focuses on the cultural history of the Deccan region of South India, primarily in the late medieval and early modern periods (1200-1600). His primary interest is in the historical interactions between the region's established Indic culture and the Persianate culture that arrived when the Delhi Sultanate annexed the region in the early fourteenth century. To study the dynamics of this process, he relies on a broad range of evidence--literary, epigraphic, numismatic, architectural, and archaeological--gathered over the course of numerous trips to the field since the early 1980s. Since 1987, he has been associated with the Vijayanagara Research Project, an international team of scholars in different disciplines dedicated to documentation and interpretation of the site of Vijayanagara, capital of the state that dominated the southern part of the Indian peninsula between the 1340s and 1565. This work has led to the publication of two books; one on late sixteenth-century understandings of Vijayanagara based on a Telugu historiographic text written in the region some 35 years after the collapse of the state (Tidings of the King: a Translation and Ethnohistorical Analysis of the Rayavacakamu, University of Hawai'i Press, 1993), and the other a 3-volume work presenting comprehensive architectural documentation of the over 400 temples and other structures preserved in one key zone of the site (co-authored with George Michell, Vijayanagara: Architectural Inventory of the Sacred Centre, New Delhi: American Institute of Indian Studies and Manohar, 2001). He has also published numerous articles on various topics relating to Vijayanagara, including the pre-Vijayanagara history of the site, the reuse of architectural components retrieved from earlier buildings, the system of elite dress at the Vijayanagara court, the ability of political elites to move between the Indic and Persianate worlds, and historical patterns of coin use by both elites and non-elites in the Deccan. Since 2000, his work has increasingly focused on Persianate Islamic architecture in the Deccan, and his articles have dealt with topics ranging from the first appearance of Sultanate style architecture in the region in the early fourteenth century, to the founding and design of Hyderabad, laid out as a new capital by the Qutb Shahi sultans in the late 16th century. His 2014 book, Power, Memory, Architecture: Contested Sites on India's Deccan Plateau, 1300-1600, co-authored with historian Richard M. Eaton (New Delhi: Oxford) was awarded the John F. Richards prize of the American Historical Association as well as the Ananda K. Coomaraswamy Prize by the Association for Asian Studies. Other recent books include Palimpsests: buildings, sites, time (co-edited with Nadja Aksamija and Clark Maines; Turnhout: Brepols, 2017) and an architectural guidebook, Heritage of the Kakatiyas: Hanamkonda, Warangal, Palampet, Ghanpur (Mumbai: Deccan Heritage Foundation and Kakatiya Heritage Trust, 2018).