The dynamics and treatment of the borderline patient have been examined extensively by Otto Kernberg, James F. Masterson, and Richard D. Chessick as well as the present author. In this chapter their theories will be the focus of the discussion. In addition, we shall consider Heinz Kohut, for although he writes primarily about narcissistic disorders, he assumes that his theory concerning narcissistic personalities and some of his ideas regarding schizophrenia cover the main facets of the borderline syndrome.