The History of Economics Society is delighted to announce the winner of this year's Joseph Dorfman Best Dissertation Prize: Christina Laskaridis, 'Debt Sustainability: Towards a History of Theory, Policy and Measurement' (SOAS, University of London) The prize committee, consisting of Edward Nik-Khah (chair), Roni Hirsch and Antonella Rancan, explained its decision as follows: "Christina Laskaridis has written a superb dissertation on an urgent topic. Laskaridis’s specific focus is the history of Debt Sustainability Analysis (DSA), as developed and put forward by the World Bank and the IMF. It examines how and why DSA took root, as well as the political and institutional stakes behind different approaches taken. Driving the development and acceptance of these approaches was the age-old conflict between debtors and creditors. The dissertation examines how the practices of economists shaped this conflict, thereby offering a compelling contribution to the history of quantification within the social sciences and the history of economic practice. Laskaridis has written a careful and meticulous history of an economics done when the stakes are high. Such economics was informed by and derived from practical needs; it was forged out of protest, geopolitical struggle, political organizing, and efforts at international collaboration and compromise. On this point, the work’s conclusion is enlightening. It shows that compromise does not necessarily win the day, but rather ideas that manage to bypass conflict, seeking the path of least resistance when compromise is impossible. When created under such conditions, ideas and practices often fail to meet either the needs of the parties to the conflict or their stated purpose. Importantly, she identifies the legacy of this conflict in a new field, the economics of debt, default, and sustainability. Laskaridis creatively uses the history of economics to address matters of vital importance. In exposing the working of power within the technocratic discourse of debt servicing, her dissertation maintains a strong and clear authorial voice. We congratulate Christina Laskaridis in her important and timely accomplishment" Previous award winners can be found on the HES website at: https://historyofeconomics.org/awards-and-honors/dorfman-dissertation-prize/ -- Carlos Eduardo Suprinyak Secretary, History of Economics Society Associate Professor, The American University of Paris