He was director of the Kaiser und Kaiserin Friedrich Kinderkrankenhaus, which he founded in Berlin with the assistance of Rudolf Virchow in 1890.
His numerous contributions to the science of medicine include treatises on school-hygiene, "Handbuch der Schulhygiene", Stuttgart, 1883; and on the cure of children's diseases, "Lehrbuch der Kinderkrankheiten," Berlin, 1892 (these latter have been translated into several languages); "Praktische Beiträge zur Kinderheilkunde," Tübingen, 1880–84.
Among his other writings, besides a great number of papers scattered through several medical journals, may be mentioned: "Pflege des Gesunden und Kranken Kindes" (The care of healthy and sick children), Stuttgart, 1885; "Das Leben des Weibes" (The life of women), ib.
He is also the author of an essay entitled, "Die Hygienische Bedeutung der Mosäischen Gesetzgebung," in which he comes forward as a stanch defender and enthusiastic admirer of the hygienic laws of Moses.
He took active part in the social and religious life of the Jewish community in Berlin, and was one of the opponents of a movement to hold Sunday services in the synagogues of that city.