George Welwood Murray Professor of Legal History

Member, Committee on Global Thought

Christina Duffy Ponsa-Kraus is a legal historian whose work focuses on the constitutional and international legal history of American empire.  She is the co-editor (with Burke Marshall) of Foreign in a Domestic Sense: Puerto Rico, American Expansion, and the Constitution (2001), and the author of several articles and essays on the constitutional implications of American territorial expansion.

Christina Duffy Ponsa-Kraus served as a law clerk to Justice Stephen G. Breyer on the United States Supreme Court in the October 2004 Term and to Judge José A. Cabranes on the Second Circuit Court of Appeals in the August 2000 Term.  She joined the faculty at Columbia Law School in 2007, and is currently at work on a constitutional and international legal history of the American empire in the late 19th and early 20th centuries.

Curriculum Vitae


Select Publications

Select Honors and Awards

  • Académica Correspondiente (“Corresponding Academic”), Academia Puertorriqueña de Jurisprudencia y Legislación (named in February 6, 2011).
  • Public Interest Faculty of the Year, Columbia Law School (2011).
  • Honorable Mention, William Nelson Cromwell Dissertation Prize (2011).


  • Ph.D., History, Princeton
  • J.D., Yale
  • M.Phil., Political Thought and Intellectual History, Cambridge
  • B.A., History and Latin American Studies, Princeton