Ralph Ince and Mitchell Leisen were both American what?
Ralph Ince Ralph Ince (January 16, 1887 – April 10, 1937) was an American pioneer film actor, director and screenwriter whose career began near the dawn of the silent film era. Ralph Ince was the brother of John Ince and Thomas H. Ince.
Edward Lindsay Ince Prof Edward Lindsay Ince FRSE (1891–1941) was a British mathematician who worked on differential equations, especially those with period coefficients such as the Mathieu equation and the Lamé equation. He introduced the Ince equation, a generalization of the Mathieu equation.