Austrian immunologist (1868–1943) Karl Landsteiner was an Austrian-American biologist, physician, and immunologist. He emigrated with his family to New York in 1923 at the age of 55 for professional opportunities, working for the Rockefeller Institute. 1,116,579 views on June 14, 2016 — Wikipedia's most-read article that day. Also most read: Atmospheric pressure, Wilhelm II, Christina Grimmie, UEFA Euro 2016. Wiki link