Trivia

In 1926 he took an interest in a young actress named Ruby Stevens hired to perform a small part as a chorus girl, "Dot" in his new play, "The Noose." After coaching Stevens in acting, he rewrote parts of the play to enhance her role then talked her into changing her name to Barbara Stanwyck. A substantial hit, the play ran 197 performances at the Hudson Theatre.

Active on Broadway from 1914-1928; he wrote twenty-three Broadway plays. He performed in ten of them and was the producer of four.

In 1927, Mack did celebrity endorsement print ads for Lucky Strike cigarettes. (Lockport Union-Sun, 20 October 1927).