Carpenter, William T.

William T. Carpenter is an American psychiatrist, a pioneer in the fields of psychiatry and pharmacology who served as an expert witness in the John W. Hinckley trial for the attempted assassination of U.S. President Ronald Reagan. His primary professional interest is in severe mental illness, especially schizophrenia, to the prevention and treatment of which he has made significant contributions in psychopathology, assessment methodology, testing of new treatments, and research ethics.