The Swedish physician Nils Rosén von Rosenstein (1706–1773) is considered to be the founder of modern pediatrics as a medical specialty, while his work "The diseases of children, and their remedies" (1764) is considered to be "the first modern textbook on the subject". Pediatrics as a specialized field of medicine continued to develop in the mid-19th century; German physician Abraham Jacobi (1830–1919) is known as the "father of American pediatrics" because of his many contributions to the field. He received his medical training in Germany and later practiced in New York City.