He holds the Felix Posen Professorship in Modern Jewish History at Johns Hopkins University and is co-editor of AJS Review.
He then studied history at Columbia University, earning an M.A.
Loeffler did postgraduate studies in Jewish religious and political thought at the Hebrew University of Jerusalem and the Pardes Institute for Jewish Studies.
[2][3][better source needed] Loeffler is a Fellow of the Institute for Advanced Israel Studies at Brandeis University.
[4] His book Rooted Cosmopolitans: Jews and Human Rights in the Twentieth Century received the 2019 Dorothy Rosenberg Prize from the American Historical Association[5] and the Jordan Schnitzer Prize from the Association for Jewish Studies.