Roger Parker's focus has been in the area of Italian opera of the nineteenth century. For ten years he was founding co-editor (with Arthur Groos) of the "Cambridge Opera Journal", and he continues as General Editor of "The Critical Edition of the Operas of Gaetano Donizetti" published it Italy by Casa Ricordi of Milan and in the United States by the University of Chicago Press under the auspices of the Fondazione Donizetti. His co-editor is Gabriele Dotto, who led Ricordi's editorial department from 1992 to 2001.