Mathematics was only one area of interest for Gerolamo Cardano (1521-76). The Italian astrologer, philosopher, physician, and scholar was also a prolific author and inveterate gambler. Dover also publishes Cardano's The Rules of Algebra. Sydney Henry Gould is a mathematician and author of Russian for the Mathematician. Samuel S. Wilks (1906-64) was a mathematician who taught at Princeton and made significant contributions to the field of mathematical statistics.