[1] After graduating from the Breslau seminary and from the University of Halle, where he received his Ph.D. in 1866; his thesis on Leibniz obtained the university prize, he was engaged as a private teacher by Baron Horace Günzburg at Paris.
During a residence of two years in that city Gross, collected in the Bibliothèque Nationale the material for his work Gallia Judaica.
In 1869, he went to Berlin, where he associated with Leopold Zunz, whose methods of research he admired and adopted.
[1] Gross's activity in the domain of literary history, especially of that of the French Jews of the Middle Ages, was extensive.
His Gallia Judaica (Paris, 1897), which deals with the medieval geography and literary history of the Jews of France, became a standard work.