Madden is active in the Society for the Study of the Crusades in the Latin East, and organizes panels for the Annual Symposium on Medieval and Renaissance Studies in Saint Louis, Missouri. He is the Director of the Crusades Studies Forum and the Medieval Italy Prosopographical Database Project, both housed at Saint Louis University.
2013 Fellow of the Medieval Academy of America
2015 American Council of Learned Societies, Fellow
2018 National Endowment for the Humanities, Public Scholar Award
Madden has written numerous books and journal articles, including the "Crusades" entry for the Encyclopædia Britannica. His research specialties are ancient and medieval history, including the Fourth Crusade, as well as ancient and medieval Italian history. His 1997 revision of The Fourth Crusade: The Conquest of Constantinople (originally authored by Donald Queller) was a selection of the History Book Club. He is also known for speaking about the ways that the history of the Crusades is often used for manipulation of modern political agendas. His book, The New Concise History of the Crusades has been translated into seven foreign languages.
His book Enrico Dandolo and the Rise of Venice won multiple awards, including the 2007 Haskins Medal from the Medieval Academy of America and the Otto Gründler Prize from the Medieval Institute. According to the Medieval Review, with this book "Madden more than ever stakes out his place as one of the most important medievalists in America at present."
His 2008 book, Empires of Trust, was a comparative study that sought elements in historic republics that led to the development of empires. In the case of Rome, he argued that their citizens and leaders acquired a level of trust among allies and potential enemies that was based upon an unusual rejection of hegemonic power. His most recent book, Venice: A New History is the culmination of decades of work in the archives and libraries of Venice.
Istanbul: City of Majesty at the Crossroads of the World, 2016 Viking
Venice: A New History, 2012, Viking
Crusades: Medieval Worlds in Conflict, 2010 Ashgate
Empires of Trust, 2008, Dutton/Penguin
The Fourth Crusade: Event, Aftermath, and Perceptions, 2008, Ashgate
Crusades: The Illustrated History, 2005, University of Michigan Press
Enrico Dandolo and the Rise of Venice, 2003, Johns Hopkins University Press
The Crusades: The Essential Readings, 2002, Blackwell
The New Concise History of the Crusades, 1999, Rowman & Littlefield
Medieval and Renaissance Venice, 1999, University of Illinois Press
The Fourth Crusade: The Conquest of Constantinople, co-author with Donald Queller, 1997, University of Pennsylvania Press
"The Venetian Version of the Fourth Crusade: Memory and the Conquest of Constantinople in Medieval Venice," Speculum 87 (2012): 311-44.
"The Latin Empire of Constantinople’s Fractured Foundation: The Rift Between Boniface of Montferrat and Baldwin of Flanders," in The Fourth Crusade: Event, Aftermath, and Perceptions (Brookfield: Ashgate Publishing, 2008): 45-52.
"Food and the Fourth Crusade: A New Approach to the 'Diversion Question,'" in Logistics of Warfare in the Age of the Crusades, John H. Pryor, ed. (Brookfield: Ashgate Publishing, 2006): 209-28.
"Venice, the Papacy, and the Crusades before 1204," in The Medieval Crusade, Susan J. Ridyard, ed. (Woodbridge: Boydell and Brewer, 2004): 85-95.
"Venice's Hostage Crisis: Diplomatic Efforts to Secure Peace with Byzantium between 1171 and 1184," in Ellen E. Kittell and Thomas F. Madden, eds., Medieval and Renaissance Venice (Urbana: University of Illinois Press, 1999): 96-108.