I found the following article, which suggests that beardedness is not as common among British academics as one might have supposed.
http://www.pharmj.com/pdf/xmas2004/pj 20041218 academics.pdf
Nevertheless, based on a study conducted by the authors, it is concluded that "for men, a beard is associated with higher status in UK academic careers". Possible reasons are:
* "Bearded men are often considered more attractive than those with no facial hair"
* "Bearded men are also perceived as being more aggressive than non-bearded men.. It is possible that increased aggression facilitates employment and success in promotion"
* "individuals perceive beards to be associated with educated and intelligent men, qualities deemed desirable for male university professors"
* "An alternative explanation for the association of academic status and facial hair is that when men reach the top of the academic career ladder they grow a beard. This may be because they are too busy to shave, or they may need to stroke the beard as an aid to intellectual thought. Or they may (perhaps subconciously) feel peer pressure to grow a beard to appear more professorial."
Steny '08!