You must have met one!!!!

Nutty Professors from The Chronicle

"The absent-minded professor becomes more difficult to handle, however, when his behavior verges on the dysfunctional. All vocations attract certain personality types; academe appeals particularly to introspective, narcissistic, obsessive characters who occasionally suffer from mood disorders or other psychological problems. Often, these difficulties go untreated because they are closely tied to enhanced creativity, as can be the case with obsessive-compulsive disorder, major depression, bipolar disorder, and the kind of high-functioning autism known as Asperger's syndrome.
According to the American Psychiatric Association's diagnostic criteria, those with Asperger's syndrome will often manifest "marked impairments in the use of multiple nonverbal behaviors such as eye-to-eye gaze, facial expression, body postures, and gestures to regulate social interaction," a "failure to develop peer relationships," a "lack of spontaneous seeking to share enjoyment, interests, or achievements with other people," and a "lack of social or emotional reciprocity." In addition, those with Asperger's may be preoccupied with "stereotyped and restricted patterns of interest" that are "abnormal either in intensity or focus"; they may stick to "specific, nonfunctional routines or rituals"; they may manifest "stereotyped and repetitive motor mannerisms," or a "persistent preoccupation with parts of objects.""