J. Loren Pyror
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Dr. Pyror is one of the few employees at Springfield Elementary School who seems to actually be qualified in his field. He does have a slight tendency toward gullibility, as Bart easily tricked Pyror into sending him to a school for gifted children. Later, however, Pyror recommended that Bart repeat the fourth grade and refused to back off of his recommendation, in spite of Bart's protests.
Dr. Pyror also seems to be prone to occasional absent-mindedness. When Bart was in kindergarten, Homer and Marge saw him to discuss problems Bart was having with adjusting to school. Pyror said it was due to Bart's "flamboyantly homosexual tendencies," and then corrected himself when he realized he was looking at Milhouse's file instead of Bart's.
Pyror has had a much more uniformly positive influence on Lisa. On the same visit as when he accidentally disclosed the contents of Milhouse's file, Pyror spotted Lisa as a gifted child when she did a complicated puzzle and gave her age as "Three and three-eighths." He told Homer and Marge to nurture her gift. Later, when Lisa went through a rebellious phase, Pyror determined that it was the result of a developmental condition and correctly advised Homer about how to help her through it.
When Bart's and Lisa's arrangement to prank each other's teachers goes severely wrong, Lisa decides she has to kill Bart and chases him through Springfield Elementary School with a knife. At one point during the chase, Bart ducks into Dr. Pyror's office.
 Behind the Laughter
In recent years he have not appeared in many episodes. It is most likely because his role of being Principal Skinner's sidekick was taken by Superintendent Chalmers. His most recent appearance being in season 22's "The Blue and the Gray". As revealed in The Complete First Season DVD, Dr. J. Loren Pryor was based on the original drawings of Principal Skinner. This can be accessed on the third DVD in the box set under special features. Once your in there you can find original character art and this will be shown. Also, in the season 2 DVD commentary for "Bart Gets an "F"", it is revealed that Dr. J. Loren Pryor name is supposed to be a play of him prying into peoples heads.