MAMARONECK, N.Y. (AP) _ Dr. Leopold Bellak, an expert on psychological testing and abnormal psychology, died Friday of pneumonia. He was 83.

Bellak, the author of about 40 books and 200 scholarly articles, gave frequent lectures and appeared on television talk shows. He also narrated a series about human consciousness for the Public Broadcasting Service.

He had extensive knowledge about brief and emergency psychotherapy, adult attention deficit disorder, and schizophrenia. He also was among the early advocates of walk-in psychiatric clinics in hospitals.

Bellak may have been best known for his work with the Thematic Apperception Test, better known as the T.A.T., which uses evocative pictures to discover a person's unconscious fantasies. He also helped create another version of the test for children, called the Children's Apperception Test, or C.A.T.

Bellak received the ``Distinguished Professional Contributions to Knowledge'' award in 1993 from the American Psychological Association.

David Gengenbach

WINSTED, Conn. (AP) _ David Gengenbach, who oversaw the design of some of Walt Disney World's most popular rides, died Monday of complications from a heart transplant. He was 66.

Hired in 1966 as a project manager and project engineer, Gengenbach worked his way up to vice president of Walt Disney's WED Enterprises.

During his tenure he oversaw the Pirates of the Caribbean boat conveyance system, directed the design and installation of Space Mountain and worked on the 20,000 Leagues Under the Sea ride. He also worked on the design and implementation of the Mark III and Mark IV monorail systems.

Prior to working at Disney, Gengenbach worked as an engineer with Tubular Aircraft and was a member of the Experimental Aircraft Association.

His influence on the Magic Kingdom is marked by an honorary tombstone outside the Haunted Mansion ride at the theme park.