メソッド演技法
Mann was influential in developing the concept of Method acting in America. While many other Method advocates (including Lee Strasberg) shared their knowledge at the Actors Studio, Mann taught his own classes at his Actor's Workshop, founded in 1953. Along with Lloyd Richards (a fellow Toronto native and chief assistant director of the school), Mann also managed to create a comfortable atmosphere for actors of all races. Alumni of his school include Ruby Dee, Billy Dee Williams, Ossie Davis, Sidney Poitier, Al Lewis, and Vic Morrow.