sentences:  In 1911 he formed a vaudeville duo with pianist Blanche Vincent, and they toured as “Mack and Vincent” with some success on the Orpheum circuit, in addition to managing cabarets in New York City.Vincent was often identified as Mack's wife, but there is no confirmation that they actually married.The duo disbanded in 1919 and Mack embarked on a stage career, with brief returns to vaudeville in 1921–22.