Tobias Dantzig (/ˈdæntsɪɡ/; February 19, 1884 – August 9, 1956) was a Russian-American mathematician, the father of George Dantzig, and the author of Number: The Language of Science (A critical survey written for the cultured non-mathematician) (1930) and Aspects of Science (New York, Macmillan, 1937).