* After getting to know the sarcastic, short-tempered, undiplomatic Major O'Mara through the eyes of Conway and other point-of-view characters, ''Mind Changer'' gives an in-depth view of the Chief Psychologist that can even change a reader's mind about him. It is genuinely touching to see him retire from Sector General, and all the moreso to discover his personal relationship with the fur-damaged Kelgian Marrasarah, whose Educator mind tape he's carried for some ''thirty years''.