Karl Landsteiner ("tuberculinum prestinum"). He also published a number of papers, five of them being published in Dutch by the Royal Academy of Sciences. Yet working conditions proved to be not much better than in post-war Vienna. So Landsteiner accepted the invitation that reached him from New York, initiated by Simon Flexner, who was familiar with Landsteiner's work, to work for the Rockefeller Institute. He arrived there with his family in the spring of 1923. Throughout the 1920s Landsteiner worked on the problems of immunity and allergy. In 1927 he discovered new blood groups: M, N and P, refining the work he
Karl Landsteiner had begun 20 years before. Shortly thereafter, Landsteiner and his collaborator, Philip Levine, published the work and, later that same year, the types began to be used in paternity suits. Landsteiner was posthumously awarded the Lasker-DeBakey Clinical Medical Research Award in 1946 and elected a Foreign Member of the Royal Society (ForMemRS) in 1941. Landsteiner converted from Judaism to Roman Catholicism in 1890. In 1916 he married Leopoldine Helene Wlasto, a Greek Orthodox who converted to her husband's Roman Catholic faith. In 1937 Landsteiner took unsuccessful legal action against an American publisher who had included him in the book "Who's