 In 1941, Rosenberger opened the first "shatnes" laboratory in North America in the Williamsburg section of Brooklyn.In his later years, Rosenberger had various assistants at his laboratory among them Yoel Schockett and Aron Drebin, who both later opened laboratories of their own.Schockett currently leads a shatnes laboratory in Lakewood, New Jersey and Drebin currently leads a shatnes laboratory in the Flatbush neighborhood of Brooklyn.